diff --git a/oj/custom_settings.example.py b/oj/custom_settings.example.py
index a1d10903..efe21bd6 100644
--- a/oj/custom_settings.example.py
+++ b/oj/custom_settings.example.py
@@ -1,7 +1,9 @@
 # coding=utf-8
 import os
 
-SECRET_KEY = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
+# please set your own SECRET_KEY to a long random string
+SECRET_KEY = None
+
 
 SSO = {"callback": "https://xxxxxxxxx/login"}