diff --git a/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php b/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
index b3107e295..f9e8a7d14 100644
--- a/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
+++ b/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
@@ -523,6 +523,7 @@ class ManyToManyPersister extends AbstractCollectionPersister
      * Generate ON condition
      *
      * @param  array $mapping
+     *
      * @return array
      */
     protected function getOnConditionSQL($mapping)