Sorry, that was a click-bait headline, wasn't it? At least I won't make you click 17 times to get to the point. It's the "Add a note" feature that pops up when sharing a Google Doc. Is it useful,? Of course. Does it have a fatal flaw? I think so. When I provide comments, context, or instructions using this feature, I get no record that I sent it. So when I need to follow up to make sure a colleague has taken on a task, I can't tell for sure what I've sent using this method. Maybe I wrote poor instructions or failed to write the instructions at all. If I provide instructions here, I'll never be sure what I sent because there is no way to track these down. I guess I could share it with another account of mine, but that seems too clumsy. Instead, I just share and use the comments feature in the doc itself. I'm sure to tag the person in the comment to be sure they get a notification using the @ or + symbol before the email address. Google Docs ...