Add mention of GitLab for Open Source program

doc/subscriptions/gitlab_com/index.md

@@ -37,7 +37,9 @@ Every occupied seat is counted in the subscription, with the following exception
 NOTE:
 To support the open source community and encourage the development of open
 source projects, GitLab grants access to **Ultimate** features for all GitLab SaaS
-**public** projects, regardless of the subscription.
+**public** projects, regardless of the subscription. GitLab also provides qualifying 
+open source projects with 50,000 CI minutes and free access to the Ultimate tier for 
+groups through the [GitLab for Open Source program](https://about.gitlab.com/solutions/open-source/).
 
 ## Obtain a GitLab SaaS subscription