diff --git a/src/Gateways/Wechat/Support.php b/src/Gateways/Wechat/Support.php
index d516ecf..f97580f 100644
--- a/src/Gateways/Wechat/Support.php
+++ b/src/Gateways/Wechat/Support.php
@@ -141,6 +141,7 @@ class Support
      * @param null  $key
      *
      * @throws InvalidArgumentException
+     *
      * @return string
      */
     public static function generateSign($data, $key = null): string