One of the great things about Git is that it makes branching and merging so simple as to be a delight, not a chore. One of the consequences of that is that you tend to use far more branches than you would if you were using a lesser revision-control system. Which can make it easy to forget which branch you’re on at any given moment. So wouldn’t it be nice if you had a simple, easy-to-see reminder of where you are, visible at all times?