diff --git a/config.example.js b/config.example.js
index 9575904..9a92129 100644
--- a/config.example.js
+++ b/config.example.js
@@ -1,4 +1,5 @@
 module.exports = {
     cookie:'',
-    _xsrf:''
+    _xsrf:'',
+    concurrency:1
 }
\ No newline at end of file