I need to do this fairly frequently, and for some reason I can never remember the steps, so I'm writing it down!
This isn't news, it is lifted from the GitHub Configuring a remote for a fork and Syncing a fork pages.
$ git remote add upstream https://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git$ git fetch upstream$ git checkout master$ git merge upstream/master
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Make your edits, etc. Push (this will push to your fork), make pull-request. Next time you need to sync the orogin, start at the '
git fetch upstream' step.