diff --git a/INSTALL_DEBIAN_4.0.txt b/INSTALL_DEBIAN_4.0.txt
index 15017071ca348248053e96e05e614a92f3b9a70d..f432e607e8568757ccb7cc495220f97273ede1ce 100644
--- a/INSTALL_DEBIAN_4.0.txt
+++ b/INSTALL_DEBIAN_4.0.txt
@@ -3,7 +3,19 @@ Installation
 
 It is recommended to use a clean (fresh) Debian etch install where you just selected "Standard System" as the package selection during setup. Then follow the steps below to setup your server with ISPConfig 3:
 
-1) Install Postfix, Courier, Saslauthd, MySQL, phpMyAdmin, ntpdate, rkhunter with the following command line (on one line!):
+1) Add the debian volatile repository to the apt sources list:
+
+vi /etc/apt/sources.list
+
+and insert the line:
+
+deb http://volatile.debian.org/debian-volatile etch/volatile main contrib non-free
+
+Then run:
+
+apt-get update
+
+Now Install Postfix, Courier, Saslauthd, MySQL, phpMyAdmin, ntpdate, rkhunter with the following command line (on one line!):
 
 apt-get install postfix postfix-mysql postfix-doc mysql-client mysql-server courier-authdaemon courier-authlib-mysql courier-pop courier-pop-ssl courier-imap courier-imap-ssl libsasl2 libsasl2-modules libsasl2-modules-sql sasl2-bin libpam-mysql openssl courier-maildrop getmail4 ntp ntpdate rkhunter