misleading "man git-worktree", is last "add" argument necessarily a "branch"?

[Robert P. J. Day]

  perusing "git worktree", and man page reads:

  SYNOPSIS
       git worktree add [-f] [--detach] [--checkout] [--lock]   \
                        [-b <new-branch>] <path> [<branch>]
                                                 ^^^^^^^^^^

however, can't that last optional argument be any arbitrary commit,
not just a "branch"?

rday