[cvsnt] How to add a file on mainline when parent directory is updated from a tag?

[Macarascu Alexandru Cristian-AMACARA1]

Hi!

I perform cvs update from a tag and then I would like to add a file
under CVSNT control. I'd like to have the file added on the mainline (as
my update was from a tag, not even a branch) and I do cvs add foo.c -r
HEAD and then commit. 
1. if I do not specify -r option to commit, then what happens is that
the file is added not to the mainline, but to a branch that has the name
of my tag. What is the effect of -r on the add command, then?
2. if I try to specify -r HEAD option to commit, it returns:
commit: invalid option -- r
cvs commit: nothing known about `HEAD'
cvs [commit aborted]: correct above errors first!

Am I doing something wrong?

Best regards,
Cristian.

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