diff --git a/FAQ.md b/FAQ.md
index 80b7dc5..0aebb09 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -868,6 +868,8 @@ Then on the controlling side, you can use [default-connect-password option](http
 
 https://www.reddit.com/r/rustdesk/search/?q=key+mismatch&cId=9300c8dc-ab3b-47dd-b6da-354611a649d7&iId=7816df66-cb99-47aa-bd6a-46c427c5b3a2
 
+One notable instance, we confirmed with the client about the public key again, it is correct, but they still have key mismtach error. then we connect to their server with our client, we got key mismatch sometimes, and sometime not. The reason is they are running two rustdesk server processes.
+
 # RustDesk Service service terminated unexpectedly
 
 https://github.com/rustdesk/rustdesk/discussions/11006