See the official download page:  https://addons.nvda-project.org/addons/virtualRevision.en.html

The "Usage" section is very brief, but it's a starting point, and probably all that anyone familiar with the functionality from another screen reader needs.

I believe there is a lot of discussion going on about documentation for Add-Ons, and I am hoping that, at the very least, some sort of "Quick Start Guide" will become required.  There are a number of them that I have no idea how one does anything beyond installing them.   I don't expect a multi-chapter user guide, but something would be nice.

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Brian - Windows 10 Pro, 64-Bit, Version 1903, Build 18362  

The color of truth is grey.

           ~ André Gide