Display git branch in terminal

I am using fedora OS and I want to display git branch or tag in terminal when I go into the git folder project. I follow [this tutorial](https://fedoraproject.org/wiki/Git_quick_reference#Display_current_branch_in_bash) . After I ran: source /usr/share/git-core/contrib/completion/git-prompt.sh source ~/.bashrc It displays the git branch well. But if I run: cd .. #I go back the parent folder which is not git folder It keeps the git branch. How can I fix it?