What's the Title of that Editing How-To?

I wrote it down, I swear it, the first time someone mentioned it, and felt smug that at least I already had it noted whenever someone again praised this how-to book for writers editing their own work.

Now that I'm preparing a list for Santa, of course, I can't find the title and author anywhere. Can somebody spin around in their desk chair and give it to me? This time I'll save it more carefully, honest.

Maryn, who knows it'll turn up eventually

Yes, yes. Thank you!

Maryn, wondering what on earth she might have named the document where she jotted it down