--- a/debian/README.Debian	Fri Oct 14 14:44:08 2011 +0200
+++ b/debian/README.Debian	Sun Feb 19 23:34:32 2012 +0100
@@ -20,6 +20,11 @@
 deb http://repos.zend.com/zend-server/deb server non-free
 ::::8<-----
 
+You need to get the keys of the above repositories:
+
+    wget http://repos.zend.com/zend.key -O- | apt-key add -
+    wget https://ssl.schlittermann.de/apt.key -O- | apt-key add -
+
 Then update the package information:
 
     # aptitude update