diff --git a/lib/Doctrine/ORM/Query/ResultSetMapping.php b/lib/Doctrine/ORM/Query/ResultSetMapping.php
index 07b896695..bdd5de75e 100644
--- a/lib/Doctrine/ORM/Query/ResultSetMapping.php
+++ b/lib/Doctrine/ORM/Query/ResultSetMapping.php
@@ -347,7 +347,7 @@ class ResultSetMapping
      * @param string $class       The class name of the joined entity.
      * @param string $alias       The unique alias to use for the joined entity.
      * @param string $parentAlias The alias of the entity result that is the parent of this joined result.
-     * @param object $relation    The association field that connects the parent entity result
+     * @param string $relation    The association field that connects the parent entity result
      *                            with the joined entity result.
      *
      * @return ResultSetMapping This ResultSetMapping instance.