Sync changes from upstream repository

Hubot · Hubot · commit c3932d2d7adc · 2016-04-18T07:50:48.000-07:00
diff --git a/content/changes/2016-04-12-commit-reference-sha-api-is-now-official.md b/content/changes/2016-04-12-commit-reference-sha-api-is-now-official.md
@@ -0,0 +1,14 @@
+---
+title: Commit Reference SHA-1 API is now official
+author_name: mikemcquaid
+---
+
+We're making the [Commit Reference SHA-1 API][api-enhancements-blog-post] part of the official GitHub API.
+
+During the preview period you needed to provide the `application/vnd.github.chitauri-preview+sha` preview media type in the `Accept` header to opt-in to the changes. Now that the preview period has ended the custom [media type][custom-media-types] has changed to `application/vnd.github.v3.sha` (but the preview type will continue to work).
+
+If you have any questions or feedback, please [get in touch with us][contact]!
+
+[api-enhancements-blog-post]: /changes/2016-02-24-commit-reference-sha-api/
+[custom-media-types]: /v3/media/
+[contact]: https://github.com/contact?form[subject]=Commit+Reference+SHA-1+API
diff --git a/content/v3/media.md b/content/v3/media.md
@@ -125,6 +125,10 @@ The Commit, Commit Comparison, and Pull Request resources support
 
     application/vnd.github.VERSION.patch
 
+### sha
+
+    application/vnd.github.VERSION.sha
+
 ## Repository contents
 
 ### Raw
diff --git a/content/v3/repos/commits.md b/content/v3/repos/commits.md
@@ -45,24 +45,14 @@ patch formats.
 
 ## Get the SHA-1 of a commit reference
 
-{{#tip}}
-
-  <a name="preview-period"></a>
-
-  The API to get the SHA-1 of a commit reference is currently available for developers to preview.
-  During the preview period, the API may change without advance notice.
-  Please see the [blog post](/changes/2016-02-24-commit-reference-sha-api) for full details.
-
-  To access the API you must provide a custom [media type](/v3/media) in the `Accept` header:
-
-      application/vnd.github.chitauri-preview+sha
-
-{{/tip}}
-
 Users with read access can get the SHA-1 of a commit reference:
 
     GET /repos/:owner/:repo/commits/:ref
 
+To access the API you must provide a custom [media type](/v3/media) in the `Accept` header:
+
+    application/vnd.github.VERSION.sha
+
 To check if a remote reference's SHA-1 is the same as your local reference's SHA-1, make a `GET` request and provide the current SHA-1 for the local reference as the ETag.
 
 ### Response
