describe fails on tagless branch

try 

  git init
  echo hoi > a
  git add a
  git commit -m 'add a' a
  git describe

this yields

[lilydev@haring t]$ git describe fatal: cannot describe '3b26396bbb5f18580ffd4bc31f70ef0738ec73d6'

I would prefer it if an implicit tag INIT was supposed at the start of the history, so we'd get

  INIT-3b2...