Moving working trees within a repo

[Jamie Wilkinson]

Can I mv a working tree within a repo?  I.e. if I had a repo like so:

 f-spot/
    f-spot.cvs
    f-spot.dogfood

and I wanted to change it to:

 f-spot/
    upstream/
    dogfood/

can I just rename them using 'mv' or do I have to branch and update the
parents?