make buildkernel KERNEL or KERNCONF?

[Zachary Huang]

in the usr/src/UPDATING file with FreeBSD 4.2:

we have:

       To update from 4.0-RELEASE or later to the most current
        4.x-STABLE
        ----------
        make buildworld
        make buildkernel KERNEL=YOUR_KERNEL_HERE
        make installkernel KERNEL=YOUR_KERNEL_HERE
        reboot  (in single user) [1]
        make installworld
        mergemaster
        reboot

whereas in the 4.10 I am getting through cvsup: (notice it is
kernCONF, not KerNEL anymore).

        To update from 4.0-RELEASE or later to the most current
        4.x-STABLE
        ----------
        make buildworld
        make buildkernel KERNCONF=YOUR_KERNEL_HERE
        make installkernel KERNCONF=YOUR_KERNEL_HERE
        reboot  (in single user) [1]
        make installworld
        mergemaster             [2]
        reboot

I guess I still follow the first one since that is what came with the
4.2. and I am trying to upgrade from 4.2 to 4.10.