diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index d304dcf46801b8bb48c1332e71cd47854c94be76..3b293baa73ea7f04d1a0f65e6b84ff8fa55682a3 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -862,7 +862,7 @@ def initialize_copy(source)
   #     end
   #
   #     # This will pass with flying colors as long as there's a person key in the
-  #     # parameters, otherwise it'll raise an ActionController::MissingParameter
+  #     # parameters, otherwise it'll raise an ActionController::ParameterMissing
   #     # exception, which will get caught by ActionController::Base and turned
   #     # into a 400 Bad Request reply.
   #     def update