diff --git a/guides/source/action_controller_overview.md b/guides/source/action_controller_overview.md
index 4252b5ee9a..8ea3859475 100644
--- a/guides/source/action_controller_overview.md
+++ b/guides/source/action_controller_overview.md
@@ -794,7 +794,7 @@ class AdminsController < ApplicationController
 end
 ```
 
-With this in place, you can create namespaced controllers that inherit from `AdminController`. The filter will thus be run for all actions in those controllers, protecting them with HTTP basic authentication.
+With this in place, you can create namespaced controllers that inherit from `AdminsController`. The filter will thus be run for all actions in those controllers, protecting them with HTTP basic authentication.
 
 ### HTTP Digest Authentication