diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index e78f1f0d7e..fc8e345d43 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -461,7 +461,7 @@ module ActionController
       end
     end
 
-    # Performs keys transfomration and returns the altered
+    # Performs keys transformation and returns the altered
     # <tt>ActionController::Parameters</tt> instance.
     def transform_keys!(&block)
       @parameters.transform_keys!(&block)