diff --git a/src/Utils.php b/src/Utils.php
index d1a2c68..ce3ec61 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -354,7 +354,8 @@ class Utils
         if (!$isIntrospection && isset($name[1]) && $name[0] === '_' && $name[1] === '_') {
             Warning::warnOnce(
                 'Name "'.$name.'" must not begin with "__", which is reserved by ' .
-                'GraphQL introspection.',
+                'GraphQL introspection. In a future release of graphql this will ' .
+                'become an exception',
                 'warnAboutDunder'
             );
         }
diff --git a/tests/Type/ValidationTest.php b/tests/Type/ValidationTest.php
index 5ab9eb3..6da5718 100644
--- a/tests/Type/ValidationTest.php
+++ b/tests/Type/ValidationTest.php
@@ -61,7 +61,7 @@ class ValidationTest extends \PHPUnit_Framework_TestCase
                     'name' => '__ReservedName',
                 ]);
             }
-        ], 'Name "__ReservedName" must not begin with "__", which is reserved by GraphQL introspection.');
+        ], 'Name "__ReservedName" must not begin with "__", which is reserved by GraphQL introspection. In a future release of graphql this will become an exception');
     }
 
     public function testRejectsAnObjectTypeWithInvalidName()