Hint for rebase in progress

I was once in the middle of an interactive rebase, editing a commit and happened to do a git status. I could see that Git warns in red color "Not currently on any branch". Similarly, git branch said "* (no branch)". Having gone this far, wouldn't it be helpful for Git to also remind "Rebase in progress" or something like that, some where in these hints? Since git status is meant to display the current status of the tree, I think it's only apt for it to report so.

Because, once in a active rebase session, I think there's no command which tells user that an interactive session is in progress (or is there?); gitk doesn't help either. If the user happens to take a break or something, it might be bit perplexing to figure out where he was, why it was (seeing the working directory headless).