noun
appendix
uh-PEN-diks/əˈpendɪks/
A section of extra material at the end of a book or document.
The appendix provides a family tree after the book's main text.

Etymology
The pieces give the image of something hanging from or attached to something else. A book's appendix is an attached addition, supplementing the main text.
In context
even if there wasn't anything particularly confusing in the book, you'll read the appendix. or in Pokin's case where the appendix is just a lot more story.
More examples
- Consult the appendix for the full table.
- Several appendices contain supporting records.
- She added an appendix about the methods.
Forms
appendix · appendixes · appendices
Similar words
- supplement
- Supplement may be separate from the main publication.
- addendum
- Addendum often adds material after the original text was completed.