Wrote a few more pages of notes to incorporate into my book draft. I keep a small notebook in my pocket so when I think of things that ought to go in the book I can write those down. A ribbon holds the place where I haven't yet transferred those notes into the draft.
I also considered putting it at the start of chapter 11, but I think it flows pretty naturally from the findings of chapter 9 and I'd rather put the material earlier than later.