"git describe" documentation and behavior mismatch

Hi Git list,

the help page/manpage of the git describe command has an example with
the --all flag which should prepend the ref namespace (tags/ or
heads/):

With --all, the command can use branch heads as references, so the output shows the reference path as well:

         [torvalds@g5 git]$ git describe --all --abbrev=4 v1.0.5^2
         tags/v1.0.0-21-g975b

         [torvalds@g5 git]$ git describe --all --abbrev=4 HEAD^
         heads/lt/describe-7-g975b

Running the above commands in the git.git repository yields a different result:

    $ git describe --all --abbrev=4 v1.0.5^2
    v1.0.0-21-g975b3

No "reference path" to see. It is however shown, when the output is a
branch name:

    $ git describe --all --abbrev=4 origin/next
    heads/next

Is this expected behavior? IOW is the documentation outdated or is the
git describe command misbehaving?

Thanks,
Daniel

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