diff --git a/library/think/db/builder/Sqlite.php b/library/think/db/builder/Sqlite.php
index 55d3abc4..28a5d6f1 100644
--- a/library/think/db/builder/Sqlite.php
+++ b/library/think/db/builder/Sqlite.php
@@ -22,6 +22,7 @@ class Sqlite extends Builder
     /**
      * limit
      * @access public
+     * @param string $limit
      * @return string
      */
     public function parseLimit($limit)