diff --git a/config/discovery.yml b/config/discovery.yml
index 340407023..169bb4447 100644
--- a/config/discovery.yml
+++ b/config/discovery.yml
@@ -2,6 +2,8 @@ enable: etcd
 etcd:
   rootDirectory: openim
   address: [localhost:12379]
+  ## Attention: If you set auth in etcd
+  ## you must also update the username and password in Chat project.
   # username: "openIM"
   # password: "openIM123"