freebsd-upgrade

[Andrey S. Rybak]

hi all.
it was happened that i have no upgrade my system long time. Before that 
i used for upgrading "classic" way.
make buildworld
make buildkernel
make installkernel
mergemaster
make installworld

But in current moment as i can see the upgrading is totally changed. As 
i understand commands sequence is next:
#freebsd-update fetch
#freebsd-update install
#freebsd-update upgrade -r 9.1-RELEASE (9.1 for example)
#freebsd-update install
#reboot
#freebsd-update install
#freebsd-update install
#reboot

i have 9.0-release and i need to upgrade it. Is it correct way? i am not 
comfortable with freebsd-update command thats why i had asked this 
simple question. help please.
Thanks in advance