Private notes plugin

I was wondering if you could recommend a plugin that allows logged-in users to make private notes on a page, only visible to them (but that save for future viewing and editing by that user)? Eg for making notes on course material - I wonder if this is possible in coursepress?

PS i'm sorry im having to resort to asking this here - my googling skills must be waaaay off because i cant imagine this doesnt exist, i just cant seem to find it! There used to be a plugin called whisper, i think, but it seems to have vanished...?

Thanks :slight_smile: