diff --git a/FAQ.md b/FAQ.md
index fd6d1c1..7292531 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -401,6 +401,8 @@ Ensure your relay server (`hbbr` which uses TCP `21117` port) is running on the
 > User: Both telnet worked, but I tried to connect from the problematic device to other devices and encountered error: ***invalid public key***
 >
 > RustDesk: That's the problem. Please set correct public key on the controlled client. https://github.com/rustdesk/rustdesk/wiki/FAQ#key-mismatch
+>
+> https://github.com/rustdesk/rustdesk-server-pro/issues/939