diff --git a/Setup-Computer-Debian-11.md b/Setup-Computer-Debian-11.md
index d666c54..cbbb965 100644
--- a/Setup-Computer-Debian-11.md
+++ b/Setup-Computer-Debian-11.md
@@ -98,6 +98,11 @@ make -j5 deb-pkg LOCALVERSION=-rt1
 cd ..
 
 sudo dpkg -i linux-headers-4.19.177-rt1_4.19.177-rt1-1_amd64.deb linux-image-4.19.177-rt1_4.19.177-rt1-1_amd64.deb
+
+# remove not used kernels
+sudo dpkg -r linux-image-amd64
+# e.g. # sudo dpkg -r linux-image-5.10.0-20-amd64 linux-image-5.10.0-21-amd64
+
 ```