Aw, I love it! That's such a good idea. Much more engaging than my author's notes, and it makes telling background information more dynamic. I've always wanted to show off the theory behind my protagnist's abilities. Maybe I'll steal this format.
Thanks for the side stories. I think you should focus on the main thing, but I'll gladly eat up anything you have to throw at me.

A few notes I have in particular:
Spoiler!