diff --git a/lib/public/AppFramework/Db/QBMapper.php b/lib/public/AppFramework/Db/QBMapper.php
index b8ebd379b4..dbc47d2d43 100644
--- a/lib/public/AppFramework/Db/QBMapper.php
+++ b/lib/public/AppFramework/Db/QBMapper.php
@@ -131,6 +131,7 @@ abstract class QBMapper {
 	 *
 	 * @param Entity $entity the entity that should be created/updated
 	 * @return Entity the saved entity with the (new) id
+	 * @throws \InvalidArgumentException if entity has no id
 	 * @since 15.0.0
 	 * @suppress SqlInjectionChecker
 	 */