diff --git a/CHANGELOG.md b/CHANGELOG.md
index c62c6dd6..614a05b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ This package follows standard semvar, `<major>.<minor>.<build>`. No breaking cha
 * `fill-defaults` has now be inverted to be `hide-defaults` this brings it in line with how html boolean attributes are supposed to work. If you set this value to false previously, now you can hide the section using the new property.
 * `enable-console` has now be inverted to be `hide-console` this brings it in line with how html boolean attributes are supposed to work. If you set this value to false previously, now you can hide the section using the new property.
 * Fix `constraints` display for query parameters.
+* Add `x-locale` vendor extension to specify the locale of the spec.
 
 ## 1.1 ##
 * Support dynamic curl creation.
diff --git a/docs/documentation.md b/docs/documentation.md
index 3c747cec..195914c5 100644
--- a/docs/documentation.md
+++ b/docs/documentation.md
@@ -202,29 +202,14 @@ requestInterceptor(event) {
 ```
 
 
-### SDK code samples
-OpenAPI Explorer supports inline code samples using the `x-code-samples` OpenAPI vendor extension. Just add your code sample into the array and it will dynamically appear as an example in the doc.
-```json
-"get": {
-  "x-code-samples": [{
-    "lang": "Javascript",
-    "label": "JS + Axios",
-    "source": "console.log('This is a code sample')"
-  }]
-}
-```
-<p>
-  <img src="./code-samples.png" alt="Code Samples" width="600px">
-</p>
-
-### Determining where the user is
+## Determining where the user is
 Knowing exactly where the user is can be tricky. One way is add the event listener for the type `event`. Another way is to search for the open slot dedicated to the current path details. The `path-details` slot is dynamically rendered with the appropriate `method` and `path` data properties. You can pull these out by doing this:
 ```js
 document.getElementsByTagName("openapi-explorer")[0].shadowRoot.querySelectorAll('slot[name=path-details]')[0].attributes['data-method'].value;
 document.getElementsByTagName("openapi-explorer")[0].shadowRoot.querySelectorAll('slot[name=path-details]')[0].attributes['data-path'].value;
 ```
 
-### Styling using CSS variables
+## Styling using CSS variables
 In many cases these might have already been set by your css framework, if not, and you want to override the the defaults to match your theme. For more in-depth options check out [How to style your openapi-explorer UI](./styling.md).
 * CSS (default set to page fonts) - Add to your css
 ```css
@@ -240,4 +225,37 @@ openapi-explorer {
   --pink: #e83e8c;
   --white: #fff;
 }
-```
\ No newline at end of file
+```
+
+## Vendor Overlays and custom properties
+The spec includes the ability to specify additional custom properties directly into the spec:
+
+### `x-locale` - Spec language & locale
+The specification itself can have its locale set so that the OpenAPI Explorer can automatically render in the correct language. Set the `x-locale` option into the `info` property, and if the OpenApi Specification has been translated into that language it will be converted.
+```json
+{
+    "openapi": "3.1.0",
+    "info": {
+        "title": "Test API",
+        "version": "1.0.0",
+        "x-locale": "en-US"
+    }
+}
+```
+
+For additional translated languages, please file a PR which includes translations for the keys defined in the [English Translation](../src/languages/en.js).
+
+### `x-code-samples` - SDK code samples
+OpenAPI Explorer supports inline code samples using the `x-code-samples` OpenAPI vendor extension. Just add your code sample into the array and it will dynamically appear as an example in the doc.
+```json
+"get": {
+  "x-code-samples": [{
+    "lang": "Javascript",
+    "label": "JS + Axios",
+    "source": "console.log('This is a code sample')"
+  }]
+}
+```
+<p>
+  <img src="./code-samples.png" alt="Code Samples" width="600px">
+</p>
\ No newline at end of file
diff --git a/src/languages/index.js b/src/languages/index.js
index 42034870..e596a492 100644
--- a/src/languages/index.js
+++ b/src/languages/index.js
@@ -2,8 +2,8 @@ import i18next from 'i18next';
 import en from './en.js';
 import fr from './fr.js';
 
-export async function initI18n() {
-  const initLang = window.navigator.language.substring(0, 2);
+export async function initI18n(resolvedSpecLanguage) {
+  const initLang = (resolvedSpecLanguage || window.navigator.language).substring(0, 2);
   await i18next.init({
     lng: initLang,
     fallbackLng: 'en',
diff --git a/src/openapi-explorer.js b/src/openapi-explorer.js
index 59c55681..18eb27af 100644
--- a/src/openapi-explorer.js
+++ b/src/openapi-explorer.js
@@ -411,7 +411,6 @@ export default class OpenApiExplorer extends LitElement {
     this.handleResize = this.handleResize.bind(this);
     window.addEventListener('resize', this.handleResize);
     this.loading = true;
-    initI18n();
 
     const parent = this.parentElement;
     if (parent) {
@@ -563,6 +562,7 @@ export default class OpenApiExplorer extends LitElement {
         console.error('Unable to resolve the API spec. '); // eslint-disable-line no-console
         return;
       }
+      initI18n(spec.info?.['x-locale']);
       if (!this.serverUrl) {
         this.serverUrl = spec.servers[0]?.computedUrl || spec.servers[0]?.url;
       }