diff --git a/guides/source/action_controller_overview.md b/guides/source/action_controller_overview.md
index 40eb838d328aeaca9585014d9de333df045a30d4..69c4a00c5f235af8cb7a8fa419ededf1a105b831 100644
--- a/guides/source/action_controller_overview.md
+++ b/guides/source/action_controller_overview.md
@@ -61,7 +61,7 @@ end
 
 The [Layouts & Rendering Guide](layouts_and_rendering.html) explains this in more detail.
 
-`ApplicationController` inherits from `ActionController::Base`, which defines a number of helpful methods. This guide will cover some of these, but if you're curious to see what's in there, you can see all of them in the API documentation or in the source itself.
+`ApplicationController` inherits from `ActionController::Base`, which defines a number of helpful methods. This guide will cover some of these, but if you're curious to see what's in there, you can see all of them in the [API documentation](http://api.rubyonrails.org/classes/ActionController.html) or in the source itself.
 
 Only public methods are callable as actions. It is a best practice to lower the visibility of methods (with `private` or `protected`) which are not intended to be actions, like auxiliary methods or filters.