diff --git a/README.md b/README.md
index 3796f29..696f515 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,15 @@
 # Monitoring Backuppc with Zabbix
 
-Tested with Zabbix 2.4 and Backuppc v3.
+This is based on script found in thread https://www.zabbix.com/forum/showthread.php?t=17273
+
+Tested with Zabbix 2.4 (http://www.zabbix.com/) and Backuppc v3 (http://backuppc.sourceforge.net/).
 
 ## Install
 
 1. Add a line from 'sudo' file to your sudo config
 2. copy 'zabbix-backuppc.pl' and 'zabbix-discover-backuppc.pl' to '/usr/local/bin'
 3. make it executable with backuppc user
+4. You need to have 'EnableRemoteCommands=1' in Zabbix agent config
 4. Import 'backuppc_zbx_export_templates.xml' into Zabbix and configure it
 
 ## The template contains