Correct syntax of "supfile" to keep ports upgraded?

[Ed Flecko]

Hi folks,
I'm trying to learn how to keep my FreeBSD 8.0 updated (patched with
security updates) the "correct" (I know that's subjective) way.

Here's what my supfile looks like now:

# If you add any of the ports or doc collections to this file, be sure to
# specify them with a "tag" value set to ".", like this:
#
#   ports-all tag=.
#   doc-all tag=.

*default host=cvsup10.us.freebsd.org
*default base=/var/db
*default prefix=/usr

# The following line is for 8-stable.  If you want 7-stable, 6-stable,
# 5-stable, 4-stable, 3-stable, or 2.2-stable, change to "RELENG_7",
# "RELENG_6", "RELENG_5", "RELENG_4", "RELENG_3", or "RELENG_2_2"
# respectively.

*default release=cvs tag=RELENG_8_0
*default delete use-rel-suffix

## Main Source Tree.
#
# The easiest way to get the main source tree is to use the "src-all"
# mega-collection.  It includes all of the individual "src-*" collections.
# Please note:  If you want to track -STABLE, leave this uncommented.
src-all

To keep my "ports" up to date, do I simply need to add:

ports-all tag=.

to this file before running csup or cvsup?

Thank you,
Ed