diff --git a/docker-compose-example/docker-compose.yml b/docker-compose-example/docker-compose.yml
index a3d9747..8b29986 100644
--- a/docker-compose-example/docker-compose.yml
+++ b/docker-compose-example/docker-compose.yml
@@ -7,7 +7,7 @@ services:
       TS_AUTH_KEY: ${TS_AUTH_KEY:?err} # from https://login.tailscale.com/admin/settings/authkeys
       TS_HOSTNAME: ${TS_HOSTNAME:-ts-docker}
       TS_STATE_ARG: "/var/lib/tailscale/tailscale.state" # store ts state in a local volume
-      TS_SERVE_PORT: ${TS_SERVE_PORT:-}
+      TS_SERVE_PORT: ${TS_SERVE_PORT:-} # optional port to proxy with tailscale serve (ex: '80')
     volumes:
       - ./ts_data:/var/lib/tailscale/
   myservice: