diff --git a/src/Type/Doctrine/ObjectMetadataResolver.php b/src/Type/Doctrine/ObjectMetadataResolver.php
index 6a8b4fd2..68024891 100644
--- a/src/Type/Doctrine/ObjectMetadataResolver.php
+++ b/src/Type/Doctrine/ObjectMetadataResolver.php
@@ -106,6 +106,8 @@ private function getMetadataFactory(): ?ClassMetadataFactory
 	}
 
 	/**
+	 * @api
+	 *
 	 * @template T of object
 	 * @param class-string<T> $className
 	 * @return ClassMetadata<T>|null