diff --git a/configs/res_snmp.conf.sample b/configs/res_snmp.conf.sample
index 5ca09d5761..fb7bfd7508 100644
--- a/configs/res_snmp.conf.sample
+++ b/configs/res_snmp.conf.sample
@@ -1,6 +1,17 @@
 ;
 ; Configuration file for res_snmp
+;---------------------------------
 ;
+; Res_snmp can run as a subagent or standalone SNMP agent. The standalone snmp
+; agent is based on net-snmp and will read a configuration file called
+; asterisk.conf in the net-snmp configuration file path, starting with
+; /etc/snmp on many systems.
+;
+; If you use the subagent model, you need to enable agentx in snmpd.conf
+; Note that you can only run one Asterisk on the system in this case.
+;
+; Please read documentat in doc/snmp.txt to get more information about
+; snmp support in Asterisk
 
 [general]
 ; We run as a subagent per default -- to run as a full agent