freebsd-update 8.1 to 8.1-p1

[c0re]

Hello freebsd-questions!

I've installed freebsd 8.1 and made
freebsd-update fetch
freebsd-update install
reboot

And in uname -a I still see 8.1-RELEASE, but I want to see 8.1-RELEASE-p1.

In /usr/src/sys/conf/newvers.sh I see that it is 8.1-p1

REVISION="8.1"
BRANCH="RELEASE-p1"

Why is it so? I want to know that my system is up to date with
freebsd-update, but uname -a does not show this to me.