diff --git a/INSTALL.d/INSTALL.Debian.txt b/INSTALL.d/INSTALL.Debian.txt
index 3884bc7..bcdb3a7 100644
--- a/INSTALL.d/INSTALL.Debian.txt
+++ b/INSTALL.d/INSTALL.Debian.txt
@@ -7,7 +7,7 @@ https://imapsync.lamiral.info/INSTALL.d/INSTALL.Debian.txt
 
 
 There is three install sections in this document,
-1) one for Debian 9 Stretch and Debian 10 Buster
+1) one for Debian 9 Stretch, Debian 10 Buster and Debian 11 Bullseye
 2) one for Debian 8 Jessie
 3) one for Debian 7 Wheezy
 
@@ -19,6 +19,7 @@ Type on a terminal:
 
     cat /etc/debian_version
 
+11.x => Bullseye
 10.x => Buster
  9.x => Stretch
  8.x => Jessie
@@ -40,7 +41,7 @@ https://lists.debian.org/debian-user/2016/11/msg00849.html
 
 
 =======================================================================
-  1) Installing imapsync on Debian 9 Stretch or Debian 10 Buster
+  1) Installing imapsync on Debian 9 Stretch, Debian 10 Buster or Debian 11 Bullseye
 =======================================================================
 
 How to install imapsync dependencies on a Debian system?
@@ -56,6 +57,11 @@ or
 # Debian 10 Buster
 deb http://deb.debian.org/debian buster main contrib
 
+or
+
+# Debian 11 Bullseye
+deb http://deb.debian.org/debian bullseye main contrib
+
 
 You need root privilege to run it, be root or use sudo.