Hello to any1

Just my first time to use freebsd-update on a 7.1-RELEASE, as step by step with handbook.. i think is went all fine...
But.. just a question, what mean "-p2" 7.2-RELEASE-p2 ?
$ uname -a
FreeBSD labs.xernet.net 7.2-RELEASE-p2 FreeBSD 7.2-RELEASE-p2 #0: Wed Jun 24 00:57:44 UTC 2009 root@i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC i386

Just my first time to use freebsd-update on a 7.1-RELEASE, as step by step with handbook.. i think is went all fine...
But.. just a question, what mean "-p2" 7.2-RELEASE-p2 ?
$ uname -a
FreeBSD labs.xernet.net 7.2-RELEASE-p2 FreeBSD 7.2-RELEASE-p2 #0: Wed Jun 24 00:57:44 UTC 2009 root@i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC i386