From c80246b1d1d93b7f3497f3c692af6d94c47cf7d5 Mon Sep 17 00:00:00 2001
From: Xiaobo Liu <cppcoffee@gmail.com>
Date: Sat, 12 Oct 2024 18:11:23 +0800
Subject: [PATCH] Update README.md

---
 README.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index dcd68a7..79a8ad9 100644
--- a/README.md
+++ b/README.md
@@ -39,12 +39,16 @@ $ netguard-server -c ./netguard.toml
 
 ### Run knock tool
 
-On client site, Using `netguard-tool` to send knock packets:
+On client site, Using `netguard-tool` to send TCP port knock packets.
+
+The following command sends a knock packet to unlock TCP port 10022:
 
 ```shell
 $ sudo ./netguard-tool auth --server 45.76.195.141 --protocol=tcp --unlock 10022 --key=./rsa_key
 ```
 
+If want to unlock a UDP port, use `--protocol=udp`。
+
 ### Example
 
 Two devices, one listening on port 10022 and then taken over by `netguard-server`: