diff --git a/HowtoDebian/MigrationBusterBullseye.md b/HowtoDebian/MigrationBusterBullseye.md
index 14e093b0..a1e60a46 100644
--- a/HowtoDebian/MigrationBusterBullseye.md
+++ b/HowtoDebian/MigrationBusterBullseye.md
@@ -70,6 +70,7 @@ deb http://pub.evolix.net/ bullseye/
 ~~~
 
 ~~~
+# sed -i 's/buster\/updates/bullseye-security/g' /etc/apt/sources.list
 # sed -i 's/buster/bullseye/g' /etc/apt/sources.list /etc/apt/sources.list.d/*.list
 ~~~