dhcp and dns under linux

hello,
i configurated a dns which be updated bye dhcp server, it work good bur, the resolotion invere isn't work ....
when i do nslookup then
192.168.0.200, it say dns don't find the hostname: that means that itsn't referenced in the invere zone resolution names.... even i pute the clause ddns-rev-domainname "in-addr.arpa" ?
what can i do so .....?
i m sure that the problem is in the configuration of dhcp.conf.. thanks