added note about routes for camelCased controllers and actions

docs/guide/controller.md

@@ -50,6 +50,9 @@ If controller is located inside a module its action internal route will be `modu
 
 In case module, controller or action specified isn't found Yii will return "not found" page and HTTP status code 404.
 
+> Note: If controller name or action name contains camelCased words, internal route will use dashes i.e. for
+`DateTimeController::actionFastForward` route will be `date-time/fast-forward`.
+
 ### Defaults
 
 If user isn't specifying any route i.e. using URL like `http://example.com/`, Yii assumes that default route should be