Pulling changes from fork parent in Git

Question

How do you pull changes from the parent of a fork in Git, specifically in a github configured project?

For example, say I forked http://github.com/originaluser/originalp

Answer 1

Expanding on other answers, these are the steps I took on a fork I had of tsc-watch:

git remote add upstream https://github.com/gilamran/tsc-watch.git
git fetch upstream
git merge upstream/master
git push

Explained:

1. adding the remote server as upstream
2. fetch all changes from upstream
3. merge changes from upstream branch into my master branch
4. push all changes to github