[development] can't add DRUPAL-5 tag

[Peter Wolanin]

A quick question re: using CVS.  I just updated a module, but I'm
getting an error whan I try to apply the DRUPAL-5 tag:

$ cvs tag DRUPAL-5
** ERROR: invalid tag for this directory:
** contributions/modules/og_mandatory_group
cvs tag: Pre-tag check failed
cvs [tag aborted]: correct the above errors first!


for some of my module's i have avoided branching them until the next
core is branched, and was planning to do that again.  Can the DRUPAL-5
tag only be applied as a branch tag?

thanks,

-Peter