diff --git a/README.md b/README.md
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--- a/README.md
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@@ -127,6 +127,7 @@ Use the web interface and go to "Tools" > "System Controls" > "Update." If you e
 ```
 ## Migrating
 Before switching, make sure your installation is fully up to date. Also make sure to have a backup, that is also the only way to get back to the original BirdNET-Pi.
+Please note that upgrading your underlaying OS to Bookworm is going to work. Please stick to Bullseye. If you do want Bookworm, you need to start from a fresh install and copy back your data. (remember the backup!)
 
 Run these commands to migrate to this repo:
 ```