diff --git a/cmd/main.go b/cmd/main.go
index 683a40a..0bf8fd0 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -387,7 +387,7 @@ func main() {
 	os.Exit(0)
 
 wrong_usage:
-	fmt.Fprintf(os.Stderr, "USAGE: %s server --rpc-on=addr:port --ctl-on=addr:port [--config-file=file]\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "USAGE: %s server --rpc-on=addr:port --ctl-on=addr:port --pxy-on=addr:port [--config-file=file]\n", os.Args[0])
 	fmt.Fprintf(os.Stderr, "       %s client --rpc-server=addr:port --ctl-on=addr:port [--config-file=file] [peer-addr:peer-port ...]\n", os.Args[0])
 	fmt.Fprintf(os.Stderr, "       %s version\n", os.Args[0])
 	os.Exit(1)