diff --git a/Setup-Computer-Debian-11.md b/Setup-Computer-Debian-11.md
index c1c73f8..59e6045 100644
--- a/Setup-Computer-Debian-11.md
+++ b/Setup-Computer-Debian-11.md
@@ -9,6 +9,11 @@ AllowHibernation=no
 AllowSuspendThenHibernate=no
 AllowHybridSleep=no
 ```
+- set NTP server (if defaults are not working) in /etc/systemd/timesyncd.conf
+```
+[Time]
+NTP=d.psi.ch
+```
 - Add various packages:
 
 ```