"Fast Forward" the fork! Merges any changes from orginal repository into forked repository .

gistfile1.txt

git checkout -b upstream/master
git remote add upstream git://github.com/documentcloud/underscore.git
git pull upstream master
git checkout master                          // [my master branch]
git merge upstream/master
git push origin master


## Source : https://github.com/blog/266-fast-forward-your-fork