diff --git a/tests/acceptance/acceptance/forms/AbstractTypeExtension.feature b/tests/acceptance/acceptance/forms/AbstractTypeExtension.feature
index baf5eee..2ca266f 100644
--- a/tests/acceptance/acceptance/forms/AbstractTypeExtension.feature
+++ b/tests/acceptance/acceptance/forms/AbstractTypeExtension.feature
@@ -11,6 +11,7 @@ Feature: FormType templates
       use Symfony\Component\Form\AbstractTypeExtension;
       use Symfony\Component\Form\Extension\Core\Type\FormType;
 
+      /** @extends AbstractTypeExtension<void> */
       class TestExtension extends AbstractTypeExtension
       {
           public static function getExtendedTypes(): iterable
@@ -30,6 +31,7 @@ Feature: FormType templates
       use Symfony\Component\Form\AbstractTypeExtension;
       use Symfony\Component\Form\Extension\Core\Type\FormType;
 
+      /** @extends AbstractTypeExtension<void> */
       class TestExtension extends AbstractTypeExtension
       {
           public static function getExtendedTypes(): iterable