diff --git a/How-does-RustDesk-work?.md b/How-does-RustDesk-work?.md
index a108dcc..ec121ff 100644
--- a/How-does-RustDesk-work?.md
+++ b/How-does-RustDesk-work?.md
@@ -1,5 +1,7 @@
 Below is drawn by [asur4s](https://github.com/asur4s), https://github.com/rustdesk/rustdesk/issues/594#issuecomment-1138342668.
 
+Rendizvous mediator implements client side of rendezvous protocol https://en.wikipedia.org/wiki/Rendezvous_protocol.
+
 ![image](https://user-images.githubusercontent.com/71636191/170462028-9b481abb-40bd-49df-8c05-8019325761ee.png)
 
 ![170462043-c4aefda1-3fb6-43e8-a54b-d3dec1590930](https://user-images.githubusercontent.com/71636191/170487506-8ef1f025-ad42-47f9-8d82-b49d0ec759ad.png)