diff --git a/reference/forms/types/enum.rst b/reference/forms/types/enum.rst
index 51fefe016f0..4e598f44e81 100644
--- a/reference/forms/types/enum.rst
+++ b/reference/forms/types/enum.rst
@@ -36,7 +36,7 @@ short) defined somewhere in your application. This enum has to be of type
     // src/Config/TextAlign.php
     namespace App\Config;
 
-    enum TextAlign
+    enum TextAlign: string
     {
         case Left = 'Left/Start aligned';
         case Center = 'Center/Middle aligned';