diff --git a/docs/README.zh-CN.md b/docs/README.zh-CN.md
index c40754ef..b95d9fbc 100644
--- a/docs/README.zh-CN.md
+++ b/docs/README.zh-CN.md
@@ -63,3 +63,5 @@ https://github.com/NLnetLabs/unbound
 https://github.com/OpenVPN/tap-windows6
 
 https://sourceforge.net/projects/ijbswa/
+
+https://github.com/HMBSbige/NatTypeTester