[CentOS] Extend DHCP range

I have a simple DHCP range .

option routers 192.168.1.1;

subnet 192.168.1.0 netmask 255.255.255.0 {
        range 192.168.1.60 192.168.1.129;
        range 192.168.1.150 192.168.1.199;
        }

So I want to add a range 192.168.2.1 -> 192.168.2.254
so I did this:

subnet 192.168.1.0 netmask 255.255.254.0 {
        range 192.168.1.60 192.168.1.129;
        range 192.168.1.150 192.168.1.199;
        range 192.168.2.1 192.168.2.254;
        }

then tried to restart the dhcpd server... This did not work.
How do I get more dhcp addresses  ?

Thanks,

Jerry