For items that are "premium" / "Enterprise Only", it would be helpful to list on the top of any article/user guide/blog, etc. that the item discussed is an Enterprise Only feature. 

For instance, the "blog" post https://www.openproject.org/blog/step-by-step-guide-boards-for-scrum-and-agile-project-management/ lists that it is a "premium" feature at the very bottom of the article, not the top. 

In general, we find it very difficult to view what features are "premium" or "Enterprise Only" in the User Guide/Documentation.