diff --git a/zfsync.sh b/zfsync.sh
index 51c3595..a522199 100755
--- a/zfsync.sh
+++ b/zfsync.sh
@@ -2,7 +2,7 @@
 
 # zfsync: sync zfs pool(s) between two servers
 
-# in case of failure, unexpected reboot while syncing, etc.:
+# before first use, or in case of failure, unexpected reboot while syncing, etc.:
 #
 # launch "zfsync.sh init"
 #
@@ -13,12 +13,15 @@
 # - for i in ftp web mail; do zfs send servers/$i/home@newsync | ssh ${bro} zfs receive -vFd servers ;done
 # - for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done
 # - ssh ${bro} 'for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done'
+#
+# once init is done, call it using crontab:
+# */10    *       *       *       *       root    nice -n 19 /usr/local/bin/zfsync.sh >/tmp/zfsync.log
 
 
 bro="small"
 pools="ftp mail web"
 
-SENDNSCA=/usr/local/sbin/send_nsca\ -H\ 192.168.3.3\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg
+SENDNSCA=/usr/local/sbin/send_nsca\ -H\ 192.168.X.X\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg
 HOSTNAME=`/bin/hostname -f | /usr/bin/cut -d '.' -f 1,1`
 SERVICENAME=zfsync
 LOGFILE=/tmp/zfsync.log