diff --git a/lib/Doctrine/ORM/Query/AST/Node.php b/lib/Doctrine/ORM/Query/AST/Node.php
index d50e0d043..25347e577 100644
--- a/lib/Doctrine/ORM/Query/AST/Node.php
+++ b/lib/Doctrine/ORM/Query/AST/Node.php
@@ -37,6 +37,10 @@ abstract class Node
      * Implementation is not mandatory for all nodes.
      *
      * @param $walker
+     *
+     * @return string
+     *
+     * @throws ASTException
      */
     public function dispatch($walker)
     {