Merging another user's bundle/patch, adding work, keep author information

[Deniz Dogan]

I have a bzr bundle from another user which I want to merge to branch
of Emacs, then fix a little bug that was in the bundle and then push
it to the main Emacs repo.

But since I believe in credit where credit is due, I'd like the bzr
log to contain the bundle author's name. I have seen stuff like this
in the Emacs bzr log:

revno: 102746
author: Lars Magne Ingebrigtsen <email at here.com>
committer: Katsumi Yamaoka <email at here.com>

How do I achieve this? Do I just:

bzr merge the_bundle
<fix the bug>
bzr commit
bzr push

? Or do I have to take some extra action for it?

-- 
Deniz Dogan