zone "somehost.domain.tld" {
        notify no;
        type master;
        file "/etc/bind/somehost.domain.tld.zone";
};

$TTL 1D
@               IN      SOA     ns.domain.tld. hostmaster.domain.tld. (
                                2021071401      ; serial, todays date + todays serial #
                                8H              ; refresh, seconds
                                2H              ; retry, seconds
                                1W              ; expire, seconds
                                1D )            ; minimum, seconds
                                                ;
                        NS      ns              ; Inet Address of name server

                IN      A       192.168.1.1
ns              IN      A       192.168.1.1

The closing is important, otherwise the zone file will fail to load.