Quick guide to remember how to keep up to date forked repos:

First: Manage set of tracked repositories.

alvaro@skyline.local: ~/docker-openstack-cli
$ git remote -v
origin https://github.com/alsotoes/docker-openstack-cli.git (fetch)
origin https://github.com/alsotoes/docker-openstack-cli.git (push)

Second: Add the remote repo to work with.