Dealing with multiple version control systems

I love git and I use it all the time. For my personal projects, my dotfiles, my documents and even for my home directory. But for my work, I need to use mercurial, as well as git(mercurial for mozilla-central mono-repo and git for other repositories hosted separately in GitHub mostly.) I like mercurial too. But there’s a problem, whenever I switch between those version control systems, I always forget which one I’m using right now....