diff --git a/FAQ.md b/FAQ.md
index e42cead..7ed228f 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -459,6 +459,7 @@ Actually it is the same problem as above, [set correct `API` (the same as web co
 You probably have one of below mistakes.
 - You changed api from `<ip>:21114` to `<domain_name>:80`, and blocked `21114`, but you still use `<domain_name>:21114` or forget to modify. So please double confirm, change api to `http://<domain_name>:80` (`:80` is not required, it is the default http port)
 - You changed from http to https, and blocked `80`, but you still use `http:<domain_name>` or use `https://<domain_name>:21114` or forget to modify, So please double confirm, change api to `https://<domain_name>:443` (`:443` is not required, it is the default https port). Be careful here, it is `https` rather than `http`.
+- `21114` tls port is changed to `443` by rustdesk, https://github.com/rustdesk/rustdesk/discussions/10922#discussioncomment-12336832
 
 # Unexpected character when log in