[RFC] just an (stupid) idea when creating a new branch

Hi GIT folks.

I'm a complete newbie on git development so excuse me if this idea is completely stupid.

Would it be possible to let the user stick a short explanation on what a branch is supposed to implement during its creation.

That is

$ git branch --topic "Implement a killer feature \

Then it would be possible with another command to consult this topic after a while. And even more useful, when generating the patch set with the following git command

$ git-format-patch -n HEAD master

it uses the topic branch to generate as first patch a summary of the patch serie. That is

"""
Subject: [PATCH 0/n] Implement a killer feature

This This set of patches add the foo feature to GIT. """

Is it useless ?

Thanks

Francis