You can configure `git-prompt.sh` to show this manually. (I presume you're using that.)

```
# In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
# unstaged (*) and staged (+) changes will be shown next to the branch
# name.  You can configure this per-repository with the
# bash.showDirtyState variable, which defaults to true once
# GIT_PS1_SHOWDIRTYSTATE is enabled.
```

https://raw.github.com/git/git/master/contrib/completion/git-prompt.sh