[development] dev release of contrib module using CVS HEAD

I maintain a contrib module with multiple branches in drupal.org CVS. Until recently, my HEAD branch corresponded to the 2.x release. Now, I've created a DRUPAL-6--2 branch for the 2.x release. HEAD is now 3.x. My problem is that drupal.org gives me no way to change the version associated with the HEAD branch. Right now, my project page offers two releases both called "6.x-2.x-dev". One of those should be 6.x-3.x-dev. How can I change it? (Replies should probably go to this forum post: http://drupal.org/node/789978) Thanks!