Syncing a fork of github

I use github for my work and have a fork of some repositories. When I send a pull request, often I have issues with my fork being out of sync with the main repository.

Today, I synced up my fork without any issues. Here's how I did it.

Go to folder which contains the clone of of your fork.

git remote add upstream https://github.com/upstreamreponame/repo.git
git fetch upstream
git checkout master (to make sure you're on master)

If you want to make sure these changes don't show up as a checkin on ur fork:

git merge upstream/master

This worked great for me!

References:
Syncing a fork
How to update GitHub forked respository
Updating a fork directly from github