How do I add an Author's Note?

From version 1.9.15 the Author's Note is one of the sections BookyAI can write, but only when you ask for it. For a new book, tick "Author's Note" under "Which sections?" in the wizard. For an existing book, open it, click "Generate front & back matter" (or "Regenerate front & back matter") in the "Front & back matter" card and tick "Author's Note" in the list. It is a short first-person note on how the book was approached and how to read it. You can edit it like any section, and it sits between the Acknowledgments and the Introduction by default.