diff --git a/lib/Doctrine/ORM/Query/Expr.php b/lib/Doctrine/ORM/Query/Expr.php
index 246f92717..6ba6a5d73 100644
--- a/lib/Doctrine/ORM/Query/Expr.php
+++ b/lib/Doctrine/ORM/Query/Expr.php
@@ -40,10 +40,12 @@ class Expr
      *
      *     [php]
      *     // (u.type = ?1) AND (u.role = ?2)
-     *     $expr->andX('u.type = ?1', 'u.role = ?2'));
+     *     $expr->andX($expr->eq('u.type', ':1'), $expr->eq('u.role', ':2'));
      *
-     * @param mixed $x Optional clause. Defaults = null, but requires
-     *                 at least one defined when converting to string.
+     * @param Doctrine\ORM\Query\Expr\Comparison | 
+     *          Doctrine\ORM\Query\Expr\Func |
+     *          Doctrine\ORM\Query\Expr\Orx 
+    *               $x Optional clause. Defaults = null, but requires at least one defined when converting to string.
      * @return Expr\Andx
      */
     public function andX($x = null)