diff --git a/lib/Doctrine/ORM/Query/Expr.php b/lib/Doctrine/ORM/Query/Expr.php
index 2b74883db..25231822d 100644
--- a/lib/Doctrine/ORM/Query/Expr.php
+++ b/lib/Doctrine/ORM/Query/Expr.php
@@ -41,8 +41,8 @@ class Expr
      *     // (u.type = ?1) AND (u.role = ?2)
      *     $expr->andX($expr->eq('u.type', ':1'), $expr->eq('u.role', ':2'));
      *
-     * @param Expr\Comparison|Expr\Func|Expr\Orx $x Optional clause. Defaults to null, but requires at least one
-     *                                              defined when converting to string.
+     * @param Expr\Comparison|Expr\Func|Expr\Orx|string $x Optional clause. Defaults to null, but requires at least one
+     *                                                     defined when converting to string.
      *
      * @return Expr\Andx
      */