diff --git a/cmd/uncloud/service/run.go b/cmd/uncloud/service/run.go
index 15646f26..8310267d 100644
--- a/cmd/uncloud/service/run.go
+++ b/cmd/uncloud/service/run.go
@@ -50,8 +50,14 @@ func NewRunCommand() *cobra.Command {
 	cmd.Flags().StringVarP(&opts.name, "name", "n", "",
 		"Assign a name to the service. A random name is generated if not specified.")
 	cmd.Flags().StringSliceVarP(&opts.publish, "publish", "p", nil,
-		"Publish a service port to make it accessible outside the cluster. Can be specified multiple times. "+
-			"Format: [load_balancer_port:]container_port[/protocol]")
+		"Publish a service port to make it accessible outside the cluster. Can be specified multiple times.\n"+
+			"Format: [hostname:][load_balancer_port:]container_port[/protocol] or [host_ip:]:host_port:container_port[/protocol]@host\n"+
+			"Supported protocols: tcp, udp, http, https (default is tcp). If a hostname for http(s) port is not specified, a random hostname is generated.\n"+
+			"Examples:\n"+
+			"  -p 8080/https            Publish port 8080 as HTTPS via load balancer with random hostname\n"+
+			"  -p app.example.com:8080  Publish port 8080 as HTTPS via load balancer with custom hostname\n"+
+			"  -p 9000:8080             Publish port 8080 as TCP port 9000 via load balancer\n"+
+			"  -p 53:5353/udp@host      Bind UDP port 5353 to host port 53")
 
 	cmd.Flags().StringVarP(
 		&opts.cluster, "cluster", "c", "",