Prevent snmpd from logging to syslog

snmpd, if active is logging every snmp query to syslog (/var/log/messages)
if you have centralised log collecntion like me, it looks pretty ugly.
so how to disable it?
i tested it on centos5:

vi /etc/sysconfig/snmpd.options
---
# snmpd command line options
#OPTIONS="-Lsd -Lf /dev/null -p /var/run/snmpd.pid -a"

# logging to syslog is now disabled
OPTIONS="-Lf /dev/null -p /var/run/snmpd.pid -a"

 /etc/init.d/snmpd restart

ps -ef | grep -i snmp | grep -v grep