diff --git a/form/validation_groups.rst b/form/validation_groups.rst
index f3fe09313f0..7dd5f940de7 100644
--- a/form/validation_groups.rst
+++ b/form/validation_groups.rst
@@ -32,4 +32,7 @@ method::
     }
 
 In both of these cases, *only* the ``registration`` validation group will
-be used to validate the underlying object.
+be used to validate the underlying object. To apply the ``registration``
+group *and* all constraints that are not in a group, use::
+
+    'validation_groups' => array('Default', 'registration')