diff --git a/routes/index.js b/routes/index.js
index 2ec0b82..00c215a 100644
--- a/routes/index.js
+++ b/routes/index.js
@@ -1,3 +1,11 @@
+/*
+* Haoyang Ding => Nabil:
+*
+* I don't recommend you use the sendFile() to do the redirect. That's slow and sometimes cause address error.
+* Try res.redirect() next time.
+*
+* */
+
 var express = require("express");
 var router = express.Router();
 const path = require("path");