OpenBSD-4.6/distrib/notes/aviion/upgrade

dnl	$OpenBSD: upgrade,v 1.2 2009/05/17 00:31:51 sthen Exp $
dnl OpenBSDUpgrade({:-an installation tape, or the miniroot over the network-:})
To upgrade your OpenBSD installation, simply extract the new sets on
the diskless server.

It is strongly advised that you unpack the etc{:--:}OSrev.tgz set in
a temporary directory and merge changes by hand, since some components of
your system may not function correctly until your files in `/etc' are
updated.