diff --git a/actionpack/lib/action_dispatch/testing/assertions/response.rb b/actionpack/lib/action_dispatch/testing/assertions/response.rb
index 1558c3ae05c21a1e4493857a25d1c629a4e807c2..77a15f3e97943c048d183824d14cc840ca03ca66 100644
--- a/actionpack/lib/action_dispatch/testing/assertions/response.rb
+++ b/actionpack/lib/action_dispatch/testing/assertions/response.rb
@@ -20,7 +20,7 @@ module ResponseAssertions
       #
       # You can also pass an explicit status number like <tt>assert_response(501)</tt>
       # or its symbolic equivalent <tt>assert_response(:not_implemented)</tt>.
-      # See ActionDispatch::StatusCodes for a full list.
+      # See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list.
       #
       # ==== Examples
       #