diff --git a/docs/_posts/2012-01-03-layout-table-of-contents-post.md b/docs/_posts/2012-01-03-layout-table-of-contents-post.md
index f1c050bc0f7b..c1253414da2d 100644
--- a/docs/_posts/2012-01-03-layout-table-of-contents-post.md
+++ b/docs/_posts/2012-01-03-layout-table-of-contents-post.md
@@ -83,7 +83,7 @@ HTML and CSS are our tools. Mauris a ante. Suspendisse quam sem, consequat at, c
 Make any link standout more when applying the `.btn` class.
 
 ```html
-<a href="#" class="btn btn-success">Success Button</a>
+<a href="#" class="btn btn--success">Success Button</a>
 ```
 
 <div markdown="0"><a href="#" class="btn">Primary Button</a></div>
@@ -95,4 +95,4 @@ Make any link standout more when applying the `.btn` class.
 ## Notices
 
 **Watch out!** You can also add notices by appending `{: .notice}` to a paragraph.
-{: .notice}
\ No newline at end of file
+{: .notice}