After you forked a project and merged back to the original, you can simply delete the forked project.

If you are like me, I always forgot to delete the forked project. When I need to contribute again, I need to bring my forked project up to date with the original source.

There are two ways to do.

1. Deleted the forked project and fork again.
2. Bring the forked project up to date with the original.

The #1 is easy.

The #2 is also easy with command line.

In order to bring the forked project up to date, do the following:

1. git checkout master
2. git pull ssh://github.com/ORIGINAL_OWNER/ORIGINAL_REPOSITORY.git master
3. git pull origin master

The above steps are assume no conflict. If there is, you need to take care of it. A more detail instruction can be see from GitHub Help.