diff --git a/www/scripts/codecheckerviewer/ListOfBugs.js b/www/scripts/codecheckerviewer/ListOfBugs.js
index be48ded8b1..813eddfd21 100644
--- a/www/scripts/codecheckerviewer/ListOfBugs.js
+++ b/www/scripts/codecheckerviewer/ListOfBugs.js
@@ -236,7 +236,7 @@ function (declare, dom, style, Deferred, ObjectStore, Store, QueryResults,
         { name : 'Severity', field : 'severity', cellClasses : 'severity', width : '15%', formatter : severityFormatter },
         { name : 'Bug path length', field : 'bugPathLength', cellClasses : 'bug-path-length', width : '15%', formatter : bugPathLengthFormatter },
         { name : 'Review status', field : 'reviewStatus', cellClasses : 'review-status', width : '15%', formatter : reviewStatusFormatter },
-        { name : 'Detection status', field : 'detectionStatus', cellClasses : 'detection-status', width : '15%', formatter : detectionStatusFormatter }
+        { name : '<span title="' + util.getTooltip('detectionStatus') + '">Detection status</span>', field : 'detectionStatus', cellClasses : 'detection-status', width : '15%', formatter : detectionStatusFormatter }
       ];
 
       this.focused = true;
diff --git a/www/scripts/codecheckerviewer/ListOfRuns.js b/www/scripts/codecheckerviewer/ListOfRuns.js
index d012228621..f4b77f0a96 100644
--- a/www/scripts/codecheckerviewer/ListOfRuns.js
+++ b/www/scripts/codecheckerviewer/ListOfRuns.js
@@ -65,10 +65,17 @@ function (declare, dom, ItemFileWriteStore, topic, Dialog, Button,
   }
 
   function versionTagFormatter(param) {
-    var versionTag = util.createRunTag(param.runName, param.versionTag);
+    var versionTag = util.createRunTag(param.runName, param.versionTag,
+      util.getTooltip('versionTag'));
+
     return versionTag ? versionTag.outerHTML : '';
   }
 
+  function numberOfUnresolvedBugsFormatter (num) {
+    return '<span title="' + util.getTooltip('numOfUnresolved') + '">'
+      + num + '</span>'
+  }
+
   var ListOfRunsGrid = declare(DataGrid, {
     constructor : function () {
       this.store = new ItemFileWriteStore({
@@ -78,12 +85,12 @@ function (declare, dom, ItemFileWriteStore, topic, Dialog, Button,
       this.structure = [
         { name : 'Diff', field : 'diff', styles : 'text-align: center;', formatter : diffBtnFormatter},
         { name : 'Name', field : 'name', styles : 'text-align: left;', width : '100%' },
-        { name : 'Number of unresolved reports', field : 'numberofbugs', styles : 'text-align: center;', width : '20%' },
+        { name : '<span title="' + util.getTooltip('numOfUnresolved') + '">Number of unresolved reports</span>', field : 'numberofbugs', formatter: numberOfUnresolvedBugsFormatter, styles : 'text-align: center;', width : '20%' },
         { name : 'Storage date', field : 'date', styles : 'text-align: center;', width : '30%' },
         { name : 'Analysis duration', field : 'duration', styles : 'text-align: center;' },
         { name : 'Check command', field : 'checkcmd', styles : 'text-align: center;' },
-        { name : 'Detection status', field : 'detectionstatus', styles : 'text-align: center;', width : '30%' },
-        { name : 'Version tag', field : 'versionTag', formatter : versionTagFormatter },
+        { name : '<span title="' + util.getTooltip('detectionStatus') + '">Detection status</span>', field : 'detectionstatus', styles : 'text-align: center;', width : '30%' },
+        { name : '<span title="' + util.getTooltip('versionTag') + '">Version tag</span>', field : 'versionTag', formatter : versionTagFormatter },
         { name : 'Delete', field : 'del', styles : 'text-align: center;', type : 'dojox.grid.cells.Bool', editable : true }
       ];
 
diff --git a/www/scripts/codecheckerviewer/util.js b/www/scripts/codecheckerviewer/util.js
index 21b83d6a9d..b065af2aef 100644
--- a/www/scripts/codecheckerviewer/util.js
+++ b/www/scripts/codecheckerviewer/util.js
@@ -14,6 +14,18 @@ function (locale, dom, style, json) {
     'July', 'August', 'September', 'October', 'November', 'December'
   ];
 
+  var tooltips = {
+    detectionStatus : "Detection statuses are calculated based on the previous "
+                    + "detection status values when the reports are stored "
+                    + "again with the same run name. When storing the results "
+                    + "of a run from scratch then each report will have "
+                    + "detection status of 'New'.",
+    numOfUnresolved : "Number of unresolved reports are calculated on the "
+                    + "following way: 'Non unique reports' - 'Resolved' "
+                    + "- 'False positive' - 'Intentional'",
+    versionTag      : "Latest version tag of this run."
+  };
+
   return {
     /**
      * This function returns the first element of the given array for which the
@@ -314,10 +326,15 @@ function (locale, dom, style, json) {
      * @param runName {string} - Name of the run.
      * @param tag {string} - Tag of the run.
      */
-    createRunTag : function (runName, tag) {
+    createRunTag : function (runName, tag, tooltip) {
       if (!tag) return;
 
-      var tagWrapper = dom.create('span', { class : 'tag-wrapper', title: 'Version tag' });
+      if (tooltip === undefined)
+        tooltip = 'Version tag';
+
+      var tagWrapper =
+        dom.create('span', { class : 'tag-wrapper', title: tooltip });
+
       dom.create('span', {
         class : 'customIcon tag',
         style : 'color:' + this.strToColor(runName + ':' + tag)
@@ -451,6 +468,10 @@ function (locale, dom, style, json) {
 
       link.click();
       document.body.removeChild(link);
+    },
+
+    getTooltip : function (name) {
+      return tooltips[name] ? tooltips[name] : '';
     }
   };
 });