Fixed a yaml configuration block

hpatoio · hpatoio · commit 1fea07ec81b7 · 2013-03-18T18:00:28.000+01:00
diff --git a/cookbook/validation/custom_constraint.rst b/cookbook/validation/custom_constraint.rst
@@ -238,7 +238,7 @@ not to the property:
         # src/Acme/BlogBundle/Resources/config/validation.yml
         Acme\DemoBundle\Entity\AcmeEntity:
             constraints:
-                - ContainsAlphanumeric
+                ContainsAlphanumeric: ~
 
     .. code-block:: php-annotations
 
