Reverse delegation on bind 8.2.2

[sfranchini at cdmtc.it]

Hello to all,
         our ISP gave us the following range x.y.z.192/192 and we need to
         set up reverse mapping. I did it with BIND 4.x just putting the
         following
         statement in my named.boot file

         primary 192/192.z.y.x.in-addr.arpa file.db.rev

         But now we have moved to BIND 8.2.2 and I don't know how to do the
         same !!!! Can anyone help me ???
         Thansk.

         Stefano