symfony
diff --git a/‎UPGRADE-3.4.md
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@@ -410,6 +410,14 @@ TwigBridge
 
  * deprecated the `Symfony\Bridge\Twig\Form\TwigRenderer` class, use the `FormRenderer`
    class from the Form component instead
+   
+    * the service `twig.form.renderer` is now an instance of `FormRenderer`. 
+      So you might have to adjust your type-hints to `FormRendererInterface` if you are still relying on 
+      the `TwigRendererInterface` which was deprecated in Symfony 3.2
+      
+    * retrieving the Renderer runtime from the twig environment via 
+      `$twig->getRuntime('Symfony\Bridge\Twig\Form\TwigRenderer')` is not working anymore 
+       and should be replaced with `$twig->getRuntime('Symfony\Component\Form\FormRenderer')` instead
 
  * deprecated `Symfony\Bridge\Twig\Command\DebugCommand::set/getTwigEnvironment` and the ability
    to pass a command name as first argument