I strongly believe that it is key to describe everything that you have built as part of your Power BI model. As we all have a hate-love relationship with documenting our work, the external tool that I build to document your Power BI solutions could come in useful. In particular everything you add and only exists in your model is important to describe properly. This documentation is key once you share your data model with others and they try to understand the goal of a measure, column or anything else. Other than that, documentation also comes in useful if you handover your solution to your colleague or client.
Read on to see what you can currently document.