diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 5a38158e9f..11ac8fed20 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -563,7 +563,7 @@ module ActionDispatch
         #       admin_post DELETE /admin/posts/:id(.:format)      {:action=>"destroy", :controller=>"admin/posts"}
         # === Supported options
         #
-        # The +:path+, +:as+, +:module+, +:shallow_path+ and +:shallow_prefix+ all default to the name of the namespace.
+        # The +:path+, +:as+, +:module+, +:shallow_path+ and +:shallow_prefix+ options all default to the name of the namespace.
         #
         # [:path]
         #   The path prefix for the routes.