diff --git a/id-relay-set.md b/id-relay-set.md
index 924f43d..a6b3d32 100644
--- a/id-relay-set.md
+++ b/id-relay-set.md
@@ -30,7 +30,7 @@ By default, hbbs listens on 21115(tcp) and 21116(tcp/udp), hbbr listens on 21117
 
 Please run with "-h" option to see help if you wanna choose your own port.
 
-Docker example
+#### Docker example
 ```
 sudo docker image pull rustdesk/rustdesk-server
 sudo docker run --name hbbr -p 21117:21117 -v `pwd`:/root -it --rm rustdesk/rustdesk-server hbbr -m <registered_email>