diff --git a/actionpack/lib/abstract_controller/callbacks.rb b/actionpack/lib/abstract_controller/callbacks.rb
index ef523abf48571..6ada987bdc04f 100644
--- a/actionpack/lib/abstract_controller/callbacks.rb
+++ b/actionpack/lib/abstract_controller/callbacks.rb
@@ -35,7 +35,7 @@ module Callbacks
                        skip_after_callbacks_if_terminated: true
     end
 
-    class ActionFilter
+    class ActionFilter # :nodoc:
       def initialize(actions)
         @actions = Array(actions).map(&:to_s).to_set
       end