diff --git a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
index 7b95f147d7..cbcc3e3e55 100644
--- a/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
+++ b/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
@@ -51,7 +51,7 @@ class ValidationListener implements EventSubscriberInterface
         $form = $event->getForm();
 
         if ($form->isRoot()) {
-            // Validate the form in group "Default"
+            // Form groups are validated internally (FormValidator). Here we don't set groups as they are retrieved into the validator.
             foreach ($this->validator->validate($form) as $violation) {
                 // Allow the "invalid" constraint to be put onto
                 // non-synchronized forms