Fixed missing - in the yml

Dzamir · weaverryan · commit 3ba6ca502b2d · 2013-05-15T22:24:34.000-05:00
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:
-                Acme\DemoBundle\Validator\Constraints\ContainsAlphanumeric: ~
+                - Acme\DemoBundle\Validator\Constraints\ContainsAlphanumeric: ~
 
     .. code-block:: php-annotations
 
