diff --git a/FAQ.md b/FAQ.md
index 9865546..49cc912 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -318,6 +318,9 @@ https://github.com/rustdesk/rustdesk/discussions/6398#discussioncomment-9065991
   It may be caused by using wrong volumns mapping in docker compose file, please strictly follow https://rustdesk.com/docs/en/self-host/rustdesk-server-pro/installscript/docker/#docker-compose, or you changed hbbs key but forgot to sync to hbbr (and restart), or some other reasons.
  > We have seen two cases having this hbbr key issue while upgading RustDesk server.
 
+# CTRL-ALT-DEL does not work
+- Make sure you install RustDesk on Windows, a system service is required for this so you have to install
+- Check if `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\SoftwareSASGeneration`registry have correct value, 1 or 3. https://knowledge.broadcom.com/external/article/21517/ctrlaltdel-does-not-work-on-remote-contr.html