diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index ac9cf7a80c26d8aef72b0f5f7323e9a23459c759..97a9b7be863fa1b218664daeb34493a9a93ea8da 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -179,6 +179,7 @@ def original_url
     # The +String+ MIME type of the request
     #
     #    app.get "/articles"
+    #    app.request.media_type
     #    # => "application/x-www-form-urlencoded"
     def media_type
       content_mime_type.to_s