diff --git a/Set-up-http-proxy-server.md b/Set-up-http-proxy-server.md
index 04bd098..feb2ce8 100644
--- a/Set-up-http-proxy-server.md
+++ b/Set-up-http-proxy-server.md
@@ -46,7 +46,7 @@ By default, Tinyproxy only accepts requests from `127.0.0.1`. We will modify it
 
 By default, Tinyproxy listens on port `8888`. You can find the line `port 8888` in the configuration file and change it to your desired value.
 
-By default, Tinyproxy connect to `443` and `563`. Please also add the port that RustDesk needs.
+By default, Tinyproxy connect to `443` and `563` (for `SSL`). Please also add the port that RustDesk needs.
 
 ```
 ConnectPort 443