Added namespace and use to the ProtocolValidator Class to be more clear.

patrick-mcdougle · weaverryan · commit 89a7a2aea669 · 2012-03-22T17:25:27.000-05:00
Updated NotBlankValidator to ProtocolValidator.
diff --git a/cookbook/validation/custom_constraint.rst b/cookbook/validation/custom_constraint.rst
@@ -48,10 +48,15 @@ Symfony2 will automatically look for another class, ``MyConstraintValidator``
 when actually performing the validation.
 
 The validator class is also simple, and only has one required method: ``isValid``.
-Take the ``NotBlankValidator`` as an example:
+Furthering our example, take a look at the ``ProtocolValidator`` as an example:
 
 .. code-block:: php
 
+    namespace Symfony\Component\Validator\Constraints;
+    
+    use Symfony\Component\Validator\Constraint;
+    use Symfony\Component\Validator\ConstraintValidator;
+
     class ProtocolValidator extends ConstraintValidator
     {
         public function isValid($value, Constraint $constraint)
