Added a tip in the Readme

diff --git a/Readme b/Readme
index 8eeeaff..f30d808 100644 (file)
--- a/Readme
+++ b/Readme
@@ -59,6 +59,7 @@ This configurations are shared among and affect all the hosts.
 - nameserver: the server which the hosts names will be resolved. It is the
   lookup server which the application will query first. If left blank or omited,
   it will use the /etc/resolv.conf.
+  You can use the nslookup <host> to figure out the nameserver.
 - hosts-down-limit: an absolute number, which ranges from 0 to the number of
   hosts available. This value represents the minimum number of hosts that have
   to fail (i.e. do not reply to the ping) in order to alert any external system.