diff --git a/README.md b/README.md
index 8283fe2..ae3fe4b 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,14 @@ rsync --progress -e 'ssh -p23' --recursive <Benutzername>@<Benutzername>.your-st
 ```
 https://wiki.hetzner.de/index.php/Storage_Boxes
 
+## Cronjob
+### QNAP
+Do NOT edit crontab the usual way!
+However, due to the way the QNAP firmware updates crontab, it will be overwritten on the next reboot. Obviously, you want your automation to survive reboots, so edit the crontab file directly with your text editor:
+```
+vim /etc/config/crontab
+```
+
 ## Gute Quellen
 * Bash-Skripte: https://wiki.ubuntuusers.de/Shell/Bash-Skripting-Guide_für_Anfänger/
 * Cronjobs: https://www.stetic.com/developer/cronjob-linux-tutorial-und-crontab-syntax.html
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