diff --git a/book/validation.rst b/book/validation.rst
index 74e0c97bfaf..755e2f54367 100644
--- a/book/validation.rst
+++ b/book/validation.rst
@@ -644,7 +644,7 @@ this method must return ``true``:
         AppBundle\Entity\Author:
             getters:
                 passwordLegal:
-                    - 'True': { message: 'The password cannot match your first name' }
+                    - 'IsTrue': { message: 'The password cannot match your first name' }
 
     .. code-block:: xml