diff --git a/Database/Query.php b/Database/Query.php
index 3790b7a..82639e4 100644
--- a/Database/Query.php
+++ b/Database/Query.php
@@ -1250,7 +1250,7 @@ protected function _update()
 	 * @internal
 	 *
 	 * @param string|array $where
-	 * @param null         $value
+	 * @param string       $value
 	 * @param string       $type
 	 * @param string       $op
 	 * @param bool         $bind