diff --git a/Installation-using-egroupware-docker-RPM-DEB-package.md b/Installation-using-egroupware-docker-RPM-DEB-package.md
index 2f8fdb2..6c96912 100644
--- a/Installation-using-egroupware-docker-RPM-DEB-package.md
+++ b/Installation-using-egroupware-docker-RPM-DEB-package.md
@@ -34,7 +34,7 @@ sudo apt install gnupg # required, but not installed by apt-key add in Debian 10
 wget -nv https://download.opensuse.org/repositories/server:eGroupWare/xUbuntu_20.04/Release.key -O - | sudo apt-key add -
 sudo apt update
 ```
-(replace ```20.04``` with ```18.04``` or ```16.04```, or ```xUbuntu_20.04``` with ```Debian_10```)
+(replace ```20.04``` with ```18.04``` or ```16.04```, or ```xUbuntu_20.04``` with ```Debian_10``` or ```Debian_11```)
 
 > We have now also a 20.1 Univention App available in their TestAppCenter, which [need to be enabled](https://docs.software-univention.de/app-provider.html#testing:test-app-center) before you get the 20.1 versions offered for updating as usual.