bzr heads help

[Eli Zaretskii]

> Date: Tue, 30 Aug 2011 09:56:27 +0300
> From: Alexander Belchenko <bialix at ukr.net>
> Cc: bazaar at lists.canonical.com
> 
> > 2. What is the difference between live and dead heads? My guess is that
> > a live head is one that exists in a branch, but has not been merged into
> > any other branch?
> 
> live head -- exists in the branch as branch tip.
> 
> dead head -- tip revision not in the branch.
> 
> Dead head created by `bzr uncommit`, `bzr merge && bzr revert` or `bzr
> pull --overwrite` (losing your local history). The purpose of `heads`
> command is to be able to find revision ids for lost revisions.

It would be _really_ nice to have all this information as part of 
"bzr help heads".

TIA