diff --git a/Gruntfile.js b/Gruntfile.js
index 1e73e90eac..6a5427c13b 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,5 +1,5 @@
 /*eslint complexity: ["error",12], max-statements: ["error", 30],
-	camelcase: ["error", {"properties": "never"}]*/
+camelcase: ["error", {"properties": "never"}]*/
 var testConfig = require('./build/test/config');
 
 module.exports = function (grunt) {
diff --git a/build/configure.js b/build/configure.js
index b22fbc3fc8..b952f735e1 100644
--- a/build/configure.js
+++ b/build/configure.js
@@ -6,9 +6,9 @@ var clone = require('clone');
 var dot = require('dot');
 var templates = require('./templates');
 var buildManual = require('./build-manual');
-var entities =  new (require('html-entities').AllHtmlEntities)();
+var entities = new (require('html-entities').AllHtmlEntities)();
 
-var descriptionHeaders = '| Rule ID | Description | Tags | Enabled by default |\n| :------- | :------- | :------- | :------- |\n';
+var descriptionHeaders = '| Rule ID | Description | Impact | Tags | Enabled by default |\n| :------- | :------- | :------- | :------- | :------- |\n';
 
 dot.templateSettings.strip = false;
 
@@ -24,10 +24,29 @@ function getLocale(grunt, options) {
 }
 
 function buildRules(grunt, options, commons, callback) {
+	var axeImpact = Object.freeze(['minor', 'moderate', 'serious', 'critical']); // TODO: require('../axe') does not work if grunt configure is moved after uglify, npm test breaks with undefined. Complicated grunt concurrency issue.
 	var locale = getLocale(grunt, options);
 	options.getFiles = false;
 	buildManual(grunt, options, commons, function (result) {
 
+		var metadata = {
+			rules: {},
+			checks: {}
+		};
+		var descriptions = [];
+		var tags = options.tags ? options.tags.split(/\s*,\s*/) : [];
+		var rules = result.rules;
+		var checks = result.checks;
+
+		// Translate checks
+		if (locale && locale.checks) {
+			checks.forEach(function (check) {
+				if (locale.checks[check.id] && check.metadata) {
+					check.metadata.messages = locale.checks[check.id];
+				}
+			})
+		}
+
 		function parseMetaData(source, propType) {
 			var data = source.metadata
 			var key = source.id || source.type
@@ -64,7 +83,7 @@ function buildRules(grunt, options, commons, callback) {
 
 		function getIncompleteMsg(summaries) {
 			var result = {};
-			summaries.forEach(function(summary) {
+			summaries.forEach(function (summary) {
 				if (summary.incompleteFallbackMessage) {
 					result = dot.template(summary.incompleteFallbackMessage).toString();
 				}
@@ -72,7 +91,6 @@ function buildRules(grunt, options, commons, callback) {
 			return result;
 		}
 
-
 		function replaceFunctions(string) {
 			return string.replace(/"(evaluate|after|gather|matches|source|commons)":\s*("[^"]+?")/g, function (m, p1, p2) {
 				return m.replace(p2, getSource(p2.replace(/^"|"$/g, ''), p1));
@@ -81,7 +99,6 @@ function buildRules(grunt, options, commons, callback) {
 			}).replace(/"(\(function \(\) {)([\s\S]+?)(}\)\(\))"/g, function (m) {
 				return JSON.parse(m);
 			});
-
 		}
 
 		function getSource(file, type) {
@@ -107,27 +124,6 @@ function buildRules(grunt, options, commons, callback) {
 			return v;
 		}
 
-		var metadata = {
-			rules: {},
-			checks: {}
-		};
-
-		var descriptions = [];
-
-		var tags = options.tags ? options.tags.split(/\s*,\s*/) : [];
-
-		var rules = result.rules;
-		var checks = result.checks;
-
-		// Translate checks
-		if (locale && locale.checks) {
-			checks.forEach(function (check) {
-				if (locale.checks[check.id] && check.metadata) {
-					check.metadata.messages = locale.checks[check.id]
-				}
-			})
-		}
-
 		function parseChecks(collection) {
 			return collection.map(function (check) {
 				var c = {};
@@ -145,19 +141,77 @@ function buildRules(grunt, options, commons, callback) {
 
 				return c.options === undefined ? id : c;
 			});
+		}
+
+		function parseImpactForRule(rule) {
+
 
+			function capitalize(s) {
+				return s.charAt(0).toUpperCase() + s.slice(1);
+			}
+
+			function getUniqueArr(arr) {
+				return arr.filter(function (value, index, self) {
+					return self.indexOf(value) === index;
+				})
+			}
+
+			function getImpactScores(checkCollection) {
+				return checkCollection.reduce(function (out, check) {
+					var id = typeof check === 'string' ? check : check.id;
+					var definition = clone(findCheck(checks, id));
+					if (!definition) {
+						grunt.log.error('check ' + id + ' not found');
+					}
+					if (definition && definition.metadata && definition.metadata.impact) {
+						var impactScore = axeImpact.indexOf(definition.metadata.impact);
+						out.push(impactScore);
+					}
+					return out;
+				}, []);
+			}
+
+			function getScore(checkCollection, onlyHighestScore) {
+				var scores = getImpactScores(checkCollection);
+				if (scores && scores.length) {
+					return onlyHighestScore
+						? [Math.max.apply(null, scores)]
+						: getUniqueArr(scores);
+				} else {
+					return [];
+				}
+			}
+
+			var highestImpactForRuleTypeAny = getScore(rule.any, true);
+			var allUniqueImpactsForRuleTypeAll = getScore(rule.all, false);
+			var allUniqueImpactsForRuleTypeNone = getScore(rule.none, false);
+			var cumulativeImpacts = highestImpactForRuleTypeAny.concat(allUniqueImpactsForRuleTypeAll).concat(allUniqueImpactsForRuleTypeNone);
+			var cumulativeScores = getUniqueArr(cumulativeImpacts).sort(); //order lowest to highest
+
+			return cumulativeScores.reduce(function (out, cV) {
+				return out.length
+					? out + ', ' + capitalize(axeImpact[cV])
+					: capitalize(axeImpact[cV]);
+			}, '');
 		}
 
+
 		rules.map(function (rule) {
+
+			var impact = parseImpactForRule(rule);
 			rule.any = parseChecks(rule.any);
 			rule.all = parseChecks(rule.all);
 			rule.none = parseChecks(rule.none);
-
 			if (rule.metadata && !metadata.rules[rule.id]) {
-				// Translate rules
-				metadata.rules[rule.id] = parseMetaData(rule, 'rules');
+				metadata.rules[rule.id] = parseMetaData(rule, 'rules'); // Translate rules
 			}
-			descriptions.push([rule.id, entities.encode(rule.metadata.description), rule.tags.join(', '), rule.enabled === false ? false : true]);
+			descriptions.push([
+				rule.id,
+				entities.encode(rule.metadata.description),
+				impact,
+				rule.tags.join(', '),
+				rule.enabled === false ? false : true
+			]);
 			if (tags.length) {
 				rule.enabled = !!rule.tags.filter(function (t) {
 					return tags.indexOf(t) !== -1;
diff --git a/doc/rule-descriptions.md b/doc/rule-descriptions.md
index 68e1a42261..7061cdc46d 100644
--- a/doc/rule-descriptions.md
+++ b/doc/rule-descriptions.md
@@ -1,69 +1,69 @@
-| Rule ID | Description | Tags | Enabled by default |
-| :------- | :------- | :------- | :------- |
-| accesskeys | Ensures every accesskey attribute value is unique | wcag2a, wcag211, cat.keyboard | true |
-| area-alt | Ensures <area> elements of image maps have alternate text | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
-| aria-allowed-attr | Ensures ARIA attributes are allowed for an element's role | cat.aria, wcag2a, wcag411, wcag412 | true |
-| aria-dpub-role-fallback | Ensures unsupported DPUB roles are only used on elements with implicit fallback roles | cat.aria, wcag2a, wcag131 | true |
-| aria-hidden-body | Ensures aria-hidden='true' is not present on the document body. | cat.aria, wcag2a, wcag412 | true |
-| aria-required-attr | Ensures elements with ARIA roles have all required ARIA attributes | cat.aria, wcag2a, wcag411, wcag412 | true |
-| aria-required-children | Ensures elements with an ARIA role that require child roles contain them | cat.aria, wcag2a, wcag131 | true |
-| aria-required-parent | Ensures elements with an ARIA role that require parent roles are contained by them | cat.aria, wcag2a, wcag131 | true |
-| aria-roles | Ensures all elements with a role attribute use a valid value | cat.aria, wcag2a, wcag131, wcag411, wcag412 | true |
-| aria-valid-attr-value | Ensures all ARIA attributes have valid values | cat.aria, wcag2a, wcag131, wcag411, wcag412 | true |
-| aria-valid-attr | Ensures attributes that begin with aria- are valid ARIA attributes | cat.aria, wcag2a, wcag411 | true |
-| audio-caption | Ensures <audio> elements have captions | cat.time-and-media, wcag2a, wcag121, section508, section508.22.a | true |
-| blink | Ensures <blink> elements are not used | cat.time-and-media, wcag2a, wcag222, section508, section508.22.j | true |
-| button-name | Ensures buttons have discernible text | cat.name-role-value, wcag2a, wcag412, section508, section508.22.a | true |
-| bypass | Ensures each page has at least one mechanism for a user to bypass navigation and jump straight to the content | cat.keyboard, wcag2a, wcag241, section508, section508.22.o | true |
-| checkboxgroup | Ensures related <input type="checkbox"> elements have a group and that the group designation is consistent | cat.forms, best-practice | true |
-| color-contrast | Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds | cat.color, wcag2aa, wcag143 | true |
-| definition-list | Ensures <dl> elements are structured correctly | cat.structure, wcag2a, wcag131 | true |
-| dlitem | Ensures <dt> and <dd> elements are contained by a <dl> | cat.structure, wcag2a, wcag131 | true |
-| document-title | Ensures each HTML document contains a non-empty <title> element | cat.text-alternatives, wcag2a, wcag242 | true |
-| duplicate-id | Ensures every id attribute value is unique | cat.parsing, wcag2a, wcag411 | true |
-| empty-heading | Ensures headings have discernible text | cat.name-role-value, best-practice | true |
-| focus-order-semantics | Ensures elements in the focus order have an appropriate role | cat.keyboard, best-practice, experimental | true |
-| frame-tested | Ensures <iframe> and <frame> elements contain the axe-core script | cat.structure, review-item | true |
-| frame-title-unique | Ensures <iframe> and <frame> elements contain a unique title attribute | cat.text-alternatives, best-practice | true |
-| frame-title | Ensures <iframe> and <frame> elements contain a non-empty title attribute | cat.text-alternatives, wcag2a, wcag241, section508, section508.22.i | true |
-| heading-order | Ensures the order of headings is semantically correct | cat.semantics, best-practice | true |
-| hidden-content | Informs users about hidden content. | cat.structure, experimental, review-item | true |
-| html-has-lang | Ensures every HTML document has a lang attribute | cat.language, wcag2a, wcag311 | true |
-| html-lang-valid | Ensures the lang attribute of the <html> element has a valid value | cat.language, wcag2a, wcag311 | true |
-| image-alt | Ensures <img> elements have alternate text or a role of none or presentation | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
-| image-redundant-alt | Ensure button and link text is not repeated as image alternative | cat.text-alternatives, best-practice | true |
-| input-image-alt | Ensures <input type="image"> elements have alternate text | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
-| label-title-only | Ensures that every form element is not solely labeled using the title or aria-describedby attributes | cat.forms, best-practice | true |
-| label | Ensures every form element has a label | cat.forms, wcag2a, wcag332, wcag131, section508, section508.22.n | true |
-| landmark-banner-is-top-level | The banner landmark should not be contained in another landmark | cat.semantics, best-practice | true |
-| landmark-contentinfo-is-top-level | The contentinfo landmark should not be contained in another landmark | cat.semantics, best-practice | true |
-| landmark-main-is-top-level | The main landmark should not be contained in another landmark | cat.semantics, best-practice | true |
-| landmark-no-duplicate-banner | Ensures the document has no more than one banner landmark | cat.semantics, best-practice | true |
-| landmark-no-duplicate-contentinfo | Ensures the document has no more than one contentinfo landmark | cat.semantics, best-practice | true |
-| landmark-one-main | Ensures a navigation point to the primary content of the page. If the page contains iframes, each iframe should contain either no main landmarks or just one | cat.semantics, best-practice | true |
-| layout-table | Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute | cat.semantics, wcag2a, wcag131 | true |
-| link-in-text-block | Links can be distinguished without relying on color | cat.color, experimental, wcag2a, wcag141 | true |
-| link-name | Ensures links have discernible text | cat.name-role-value, wcag2a, wcag111, wcag412, wcag244, section508, section508.22.a | true |
-| list | Ensures that lists are structured correctly | cat.structure, wcag2a, wcag131 | true |
-| listitem | Ensures <li> elements are used semantically | cat.structure, wcag2a, wcag131 | true |
-| marquee | Ensures <marquee> elements are not used | cat.parsing, wcag2a, wcag222 | true |
-| meta-refresh | Ensures <meta http-equiv="refresh"> is not used | cat.time, wcag2a, wcag2aaa, wcag221, wcag224, wcag325 | true |
-| meta-viewport-large | Ensures <meta name="viewport"> can scale a significant amount | cat.sensory-and-visual-cues, best-practice | true |
-| meta-viewport | Ensures <meta name="viewport"> does not disable text scaling and zooming | cat.sensory-and-visual-cues, wcag2aa, wcag144 | true |
-| object-alt | Ensures <object> elements have alternate text | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
-| p-as-heading | Ensure p elements are not used to style headings | cat.semantics, wcag2a, wcag131, experimental | true |
-| page-has-heading-one | Ensure that the page, or at least one of its frames contains a level-one heading | cat.semantics, best-practice | true |
-| radiogroup | Ensures related <input type="radio"> elements have a group and that the group designation is consistent | cat.forms, best-practice | true |
-| region | Ensures all content is contained within a landmark region | cat.keyboard, best-practice | true |
-| scope-attr-valid | Ensures the scope attribute is used correctly on tables | cat.tables, best-practice | true |
-| server-side-image-map | Ensures that server-side image maps are not used | cat.text-alternatives, wcag2a, wcag211, section508, section508.22.f | true |
-| skip-link | Ensure all skip links have a focusable target | cat.keyboard, best-practice | true |
-| tabindex | Ensures tabindex attribute values are not greater than 0 | cat.keyboard, best-practice | true |
-| table-duplicate-name | Ensure that tables do not have the same summary and caption | cat.tables, best-practice | true |
-| table-fake-caption | Ensure that tables with a caption use the <caption> element. | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true |
-| td-has-header | Ensure that each non-empty data cell in a large table has one or more table headers | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true |
-| td-headers-attr | Ensure that each cell in a table using the headers refers to another cell in that table | cat.tables, wcag2a, wcag131, section508, section508.22.g | true |
-| th-has-data-cells | Ensure that each table header in a data table refers to data cells | cat.tables, wcag2a, wcag131, section508, section508.22.g | true |
-| valid-lang | Ensures lang attributes have valid values | cat.language, wcag2aa, wcag312 | true |
-| video-caption | Ensures <video> elements have captions | cat.text-alternatives, wcag2a, wcag122, section508, section508.22.a | true |
-| video-description | Ensures <video> elements have audio descriptions | cat.text-alternatives, wcag2aa, wcag125, section508, section508.22.b | true |
\ No newline at end of file
+| Rule ID | Description | Impact | Tags | Enabled by default |
+| :------- | :------- | :------- | :------- | :------- |
+| accesskeys | Ensures every accesskey attribute value is unique | Serious | wcag2a, wcag211, cat.keyboard | true |
+| area-alt | Ensures <area> elements of image maps have alternate text | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
+| aria-allowed-attr | Ensures ARIA attributes are allowed for an element's role | Critical | cat.aria, wcag2a, wcag411, wcag412 | true |
+| aria-dpub-role-fallback | Ensures unsupported DPUB roles are only used on elements with implicit fallback roles | Moderate | cat.aria, wcag2a, wcag131 | true |
+| aria-hidden-body | Ensures aria-hidden='true' is not present on the document body. | Critical | cat.aria, wcag2a, wcag412 | true |
+| aria-required-attr | Ensures elements with ARIA roles have all required ARIA attributes | Critical | cat.aria, wcag2a, wcag411, wcag412 | true |
+| aria-required-children | Ensures elements with an ARIA role that require child roles contain them | Critical | cat.aria, wcag2a, wcag131 | true |
+| aria-required-parent | Ensures elements with an ARIA role that require parent roles are contained by them | Critical | cat.aria, wcag2a, wcag131 | true |
+| aria-roles | Ensures all elements with a role attribute use a valid value | Serious, Critical | cat.aria, wcag2a, wcag131, wcag411, wcag412 | true |
+| aria-valid-attr-value | Ensures all ARIA attributes have valid values | Critical | cat.aria, wcag2a, wcag131, wcag411, wcag412 | true |
+| aria-valid-attr | Ensures attributes that begin with aria- are valid ARIA attributes | Critical | cat.aria, wcag2a, wcag411 | true |
+| audio-caption | Ensures <audio> elements have captions | Critical | cat.time-and-media, wcag2a, wcag121, section508, section508.22.a | true |
+| blink | Ensures <blink> elements are not used | Serious | cat.time-and-media, wcag2a, wcag222, section508, section508.22.j | true |
+| button-name | Ensures buttons have discernible text | Serious, Critical | cat.name-role-value, wcag2a, wcag412, section508, section508.22.a | true |
+| bypass | Ensures each page has at least one mechanism for a user to bypass navigation and jump straight to the content | Serious | cat.keyboard, wcag2a, wcag241, section508, section508.22.o | true |
+| checkboxgroup | Ensures related <input type="checkbox"> elements have a group and that the group designation is consistent | Critical | cat.forms, best-practice | true |
+| color-contrast | Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds | Serious | cat.color, wcag2aa, wcag143 | true |
+| definition-list | Ensures <dl> elements are structured correctly | Serious | cat.structure, wcag2a, wcag131 | true |
+| dlitem | Ensures <dt> and <dd> elements are contained by a <dl> | Serious | cat.structure, wcag2a, wcag131 | true |
+| document-title | Ensures each HTML document contains a non-empty <title> element | Serious | cat.text-alternatives, wcag2a, wcag242 | true |
+| duplicate-id | Ensures every id attribute value is unique | Moderate | cat.parsing, wcag2a, wcag411 | true |
+| empty-heading | Ensures headings have discernible text | Minor | cat.name-role-value, best-practice | true |
+| focus-order-semantics | Ensures elements in the focus order have an appropriate role | Minor | cat.keyboard, best-practice, experimental | true |
+| frame-tested | Ensures <iframe> and <frame> elements contain the axe-core script | Critical | cat.structure, review-item | true |
+| frame-title-unique | Ensures <iframe> and <frame> elements contain a unique title attribute | Serious | cat.text-alternatives, best-practice | true |
+| frame-title | Ensures <iframe> and <frame> elements contain a non-empty title attribute | Serious | cat.text-alternatives, wcag2a, wcag241, section508, section508.22.i | true |
+| heading-order | Ensures the order of headings is semantically correct | Moderate | cat.semantics, best-practice | true |
+| hidden-content | Informs users about hidden content. | Minor | cat.structure, experimental, review-item | true |
+| html-has-lang | Ensures every HTML document has a lang attribute | Serious | cat.language, wcag2a, wcag311 | true |
+| html-lang-valid | Ensures the lang attribute of the <html> element has a valid value | Serious | cat.language, wcag2a, wcag311 | true |
+| image-alt | Ensures <img> elements have alternate text or a role of none or presentation | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
+| image-redundant-alt | Ensure button and link text is not repeated as image alternative | Minor | cat.text-alternatives, best-practice | true |
+| input-image-alt | Ensures <input type="image"> elements have alternate text | Critical | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
+| label-title-only | Ensures that every form element is not solely labeled using the title or aria-describedby attributes | Serious | cat.forms, best-practice | true |
+| label | Ensures every form element has a label | Minor, Serious, Critical | cat.forms, wcag2a, wcag332, wcag131, section508, section508.22.n | true |
+| landmark-banner-is-top-level | The banner landmark should not be contained in another landmark | Moderate | cat.semantics, best-practice | true |
+| landmark-contentinfo-is-top-level | The contentinfo landmark should not be contained in another landmark | Moderate | cat.semantics, best-practice | true |
+| landmark-main-is-top-level | The main landmark should not be contained in another landmark | Moderate | cat.semantics, best-practice | true |
+| landmark-no-duplicate-banner | Ensures the document has no more than one banner landmark | Moderate | cat.semantics, best-practice | true |
+| landmark-no-duplicate-contentinfo | Ensures the document has no more than one contentinfo landmark | Moderate | cat.semantics, best-practice | true |
+| landmark-one-main | Ensures a navigation point to the primary content of the page. If the page contains iframes, each iframe should contain either no main landmarks or just one | Moderate | cat.semantics, best-practice | true |
+| layout-table | Ensures presentational <table> elements do not use <th>, <caption> elements or the summary attribute | Serious | cat.semantics, wcag2a, wcag131 | true |
+| link-in-text-block | Links can be distinguished without relying on color | Serious | cat.color, experimental, wcag2a, wcag141 | true |
+| link-name | Ensures links have discernible text | Serious | cat.name-role-value, wcag2a, wcag111, wcag412, wcag244, section508, section508.22.a | true |
+| list | Ensures that lists are structured correctly | Serious | cat.structure, wcag2a, wcag131 | true |
+| listitem | Ensures <li> elements are used semantically | Serious | cat.structure, wcag2a, wcag131 | true |
+| marquee | Ensures <marquee> elements are not used | Serious | cat.parsing, wcag2a, wcag222 | true |
+| meta-refresh | Ensures <meta http-equiv="refresh"> is not used | Critical | cat.time, wcag2a, wcag2aaa, wcag221, wcag224, wcag325 | true |
+| meta-viewport-large | Ensures <meta name="viewport"> can scale a significant amount | Minor | cat.sensory-and-visual-cues, best-practice | true |
+| meta-viewport | Ensures <meta name="viewport"> does not disable text scaling and zooming | Critical | cat.sensory-and-visual-cues, wcag2aa, wcag144 | true |
+| object-alt | Ensures <object> elements have alternate text | Serious | cat.text-alternatives, wcag2a, wcag111, section508, section508.22.a | true |
+| p-as-heading | Ensure p elements are not used to style headings | Serious | cat.semantics, wcag2a, wcag131, experimental | true |
+| page-has-heading-one | Ensure that the page, or at least one of its frames contains a level-one heading | Moderate | cat.semantics, best-practice | true |
+| radiogroup | Ensures related <input type="radio"> elements have a group and that the group designation is consistent | Critical | cat.forms, best-practice | true |
+| region | Ensures all content is contained within a landmark region | Moderate | cat.keyboard, best-practice | true |
+| scope-attr-valid | Ensures the scope attribute is used correctly on tables | Moderate, Critical | cat.tables, best-practice | true |
+| server-side-image-map | Ensures that server-side image maps are not used | Minor | cat.text-alternatives, wcag2a, wcag211, section508, section508.22.f | true |
+| skip-link | Ensure all skip links have a focusable target | Moderate | cat.keyboard, best-practice | true |
+| tabindex | Ensures tabindex attribute values are not greater than 0 | Serious | cat.keyboard, best-practice | true |
+| table-duplicate-name | Ensure that tables do not have the same summary and caption | Minor | cat.tables, best-practice | true |
+| table-fake-caption | Ensure that tables with a caption use the <caption> element. | Serious | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true |
+| td-has-header | Ensure that each non-empty data cell in a large table has one or more table headers | Critical | cat.tables, experimental, wcag2a, wcag131, section508, section508.22.g | true |
+| td-headers-attr | Ensure that each cell in a table using the headers refers to another cell in that table | Serious | cat.tables, wcag2a, wcag131, section508, section508.22.g | true |
+| th-has-data-cells | Ensure that each table header in a data table refers to data cells | Serious | cat.tables, wcag2a, wcag131, section508, section508.22.g | true |
+| valid-lang | Ensures lang attributes have valid values | Serious | cat.language, wcag2aa, wcag312 | true |
+| video-caption | Ensures <video> elements have captions | Critical | cat.text-alternatives, wcag2a, wcag122, section508, section508.22.a | true |
+| video-description | Ensures <video> elements have audio descriptions | Critical | cat.text-alternatives, wcag2aa, wcag125, section508, section508.22.b | true |
\ No newline at end of file
diff --git a/lib/core/constants.js b/lib/core/constants.js
index d49b5a5f1d..8f6169725e 100644
--- a/lib/core/constants.js
+++ b/lib/core/constants.js
@@ -30,7 +30,6 @@
 		impact: Object.freeze(['minor', 'moderate', 'serious', 'critical'])
 	};
 
-
 	definitions.forEach(function (definition) {
 		var name = definition.name;
 		var value = definition.value;