cvs tag for -STABLE for ports-supfile ? use HEAD or ???

[W C]

I just (successfully) upgraded my remote 5.2.1 box to 5.3-STABLE Feb 22 05 
with the usual
buildworld
buildkernel
installkernel
mergemaster
reboot
installworld
mergemaster
reboot
etc.

I want to upgrade my ports tree to that which is correct for -STABLE.  Is 
there a ports-STABLE cvs tag I can use, or is it safe to just use HEAD, as 
is in the stock supfile?
Thanks,

woody

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