How to Format a Glossary and Appendix (2026)

Most self-publishing authors spend weeks polishing their chapters and never think twice about what comes after the last one, until a reader emails to ask what a term meant or a reviewer notes the book has no glossary. Glossary formatting and appendix formatting are the finishing moves that separate a professional reference book from an amateur manuscript. Both live in your book’s back matter and follow simple, settled conventions. If you already understand how your book’s front and back matter structure fits together, adding a clean glossary and appendix is mostly a matter of consistency.

By the end of this 2026 guide, you will know exactly what a glossary is, what an appendix is, when your book genuinely needs each one, how to format them step by step for print and eBook, how they differ from an index and endnotes, and the seven mistakes that make back matter look sloppy. Everything here works in Microsoft Word and applies to KDP paperbacks, hardcovers, and reflowable eBooks.

What a Glossary Is (and What an Appendix Is)

A glossary is your book’s built-in dictionary: an alphabetical list of specialized terms used in the text, each followed by a short, plain definition. Readers turn to it when they hit a word they half-remember from three chapters back. In nonfiction, glossaries decode jargon; in fantasy and science fiction, they decode invented vocabulary, place names, and magic systems. A well-formatted glossary never lectures. Each entry is one or two lines, the term is bolded, and the definition says only what the reader needs to keep reading.

An appendix is different in kind. It is a container for material that supports the book but would clog the main narrative: survey questionnaires, raw data tables, extended timelines, family trees, maps, character lists, interview transcripts, or source documents. Instead of stuffing a twelve-page chronology into chapter four, you summarize it in the chapter and park the full version in Appendix A. Appendices are lettered rather than numbered, Appendix A, Appendix B, and so on, and each one gets its own title describing what it holds, such as “Appendix B: 2025 Reader Survey Results.”

Both elements belong to the back matter, the closing section of a book that also houses endnotes, the bibliography, and the index. The Chicago Manual of Style, the reference most US trade publishers follow, treats appendices and glossaries as standard back-matter components with a fixed order: appendices first, then notes, then the glossary, then the bibliography, then the index.

When Your Book Needs a Glossary

Your book needs a glossary when readers cannot finish it comfortably without one. That is the whole test. Nonfiction is the obvious case: a personal-finance book that throws around “amortization” and “fiduciary,” a health book full of anatomical terms, or a technology guide built on acronyms all owe the reader a glossary. Academic and professional books need one almost by default, because their terminology is the point. Our nonfiction formatting guide covers the full interior setup these books require, and the glossary is the natural capstone of that work.

Genre fiction earns a glossary the moment its worldbuilding outgrows the page. Epic fantasy series with invented languages, hard science fiction with fictional physics, and historical fiction thick with period terms all benefit. Cookbooks frequently gloss technique terms like “blanch” and “deglaze” for beginners, textbooks define every bolded term, and children’s educational books often include a simple glossary as a learning feature. A practical rule of thumb: if your manuscript uses fifteen or more specialized terms that a general reader would not know, build the glossary.

Skip the glossary when it would be decoration. Literary fiction for a general audience rarely needs one, memoirs almost never do, and short books can usually define terms inline on first use. A glossary nobody opens still costs layout time and page count.

When Your Book Needs an Appendix

Appendices exist for material your reader may want but your narrative does not need. Ask one question: does this content serve every reader, or only the curious few? If only the curious few, it belongs in an appendix. A business book might relegate its full survey questionnaire and raw response tables to Appendix A while the chapter carries only the headline findings. A history book can move its detailed timeline to an appendix. A cookbook can stash metric conversion charts there. Workbooks and devotionals often park extra worksheets, and family histories are famous for appendix family trees.

Use one appendix when you have a single block of supporting material; use several when the material falls into natural groups. Letter them in the order they are first mentioned in the text: Appendix A, Appendix B, Appendix C. Give each appendix a real title after the letter, because “Appendix B” tells the reader nothing while “Appendix B: Interview Transcripts” tells them everything. List every appendix in your table of contents with its full title, just like a chapter.

Resist the urge to use an appendix as a junk drawer. If material is important enough that most readers need it, it belongs in a chapter. If it is not important enough for anyone, cut it. An appendix full of padding signals an author who could not decide, while a tight appendix signals an author who respected the reader’s time. Keep it tight: a useful appendix is as long as its content requires and not a page longer.

How to Format a Glossary Step by Step

Start by collecting every term as you finalize the manuscript, not after. Keep a running list while you edit, because hunting for jargon after layout is miserable. Then alphabetize letter by letter: multiword terms sort on the first word. Decide your capitalization rule and apply it everywhere: sentence case for common nouns, capitals for proper nouns and invented terms, exactly as they appear in the text.

Format each entry the same way. Bold the term, follow it with an em dash, then write the definition in regular text as a sentence fragment or a single short sentence. Keep definitions to one or two lines, twenty to forty words at most. If a term needs a paragraph, it is not a glossary entry; define it in the text or cut it. An example entry looks like this: Amortization — The gradual repayment of a loan through scheduled payments covering both principal and interest.

Use a hanging indent so the bolded terms form a clean left column and definitions wrap neatly beneath themselves. Single-column layout is the safe choice for standard 6 x 9 trim sizes; two columns only pay off for very long glossaries in larger formats, and they complicate eBook conversion. Add cross-references sparingly with “see also” at the end of an entry, and only when the relationship genuinely helps. Finally, proofread the glossary against the text: every term must actually appear in the book, spelled exactly the same way. A glossary entry for a word you cut in edits is an embarrassing, common error.

How to Format an Appendix Step by Step

Each appendix starts on a fresh page, and in print it should start on a right-hand, recto page, just like a new chapter. Open with a clear heading: “Appendix A” on its own line, then the descriptive title beneath it, styled exactly like a chapter title. This parallel treatment tells the reader the appendix is a first-class part of the book, not an afterthought.

Inside, number everything with the appendix letter as a prefix. Tables become Table A.1 and Table A.2, figures become Figure B.1, and subsections run A.1, A.2, A.3. This keeps appendix numbering from colliding with chapter numbering. If the appendix has its own sections, give them the same heading hierarchy you used in the chapters so the design feels continuous. Carry the book’s running heads through the appendix pages, showing the appendix title, and continue the main page-number sequence without restarting it.

Reference each appendix from the main text at the natural moment, with a parenthetical like “(see Appendix A),” so readers know the material exists. Then list every appendix in the table of contents with its letter and full title. For eBooks, apply true heading styles to appendix titles so the eBook’s logical table of contents picks them up.

Glossary vs Appendix vs Index: How They Differ

New authors routinely confuse these three back-matter elements, so here is the clean distinction. A glossary defines terms. An appendix holds supplementary content. An index locates topics: it is an alphabetical list of subjects with the page numbers where each appears, built after pagination is final. Endnotes and footnotes, meanwhile, carry citations and commentary tied to specific passages. Our index formatting guide walks through building one, and our footnotes and endnotes guide covers note formatting; this guide covers the other two pieces of the puzzle.

The practical differences matter at layout time. A glossary is alphabetical by term and needs no page numbers. An appendix is sequential by letter and contains full content, tables, documents, lists. An index is alphabetical by topic and is nothing but locators. The table below summarizes when to use each.

Print vs eBook Formatting Differences

In print, the glossary and appendix obey the same rules as chapters: each starts on a fresh right-hand page, running heads continue, and page numbers run in the same sequence. Long glossaries in large trim sizes can use two columns to save pages, and appendices with wide tables may need landscape pages in extreme cases. Because print pages are fixed, you can also add “see page 142” style cross-references.

Reflowable eBooks play by different physics. There are no fixed pages, so never reference page numbers and never use multi-column layouts or text boxes; both break on small screens and in accessibility modes. Style the “Glossary” heading and each appendix title with true heading styles so the eBook navigation and Kindle’s logical TOC list them. Keep glossary entries as simple paragraphs with bold lead-ins, which reflow cleanly at any font size. Hyperlinking pays off here: link specialized terms in the text to their glossary entries, and link appendix mentions to the appendix, so eBook readers can jump with a tap. Always test the back matter in Kindle Previewer at several font sizes before you publish.

7 Glossary and Appendix Mistakes to Avoid

Run through this list before you finalize your back matter — every item below is a real mistake self-publishers make every week.

• Defining terms in the glossary that never appear in the book, usually leftovers from cut chapters.
• Writing paragraph-long definitions. A glossary entry is twenty to forty words; anything longer belongs in the text.
• Sloppy alphabetization, especially with multiword terms, hyphenated compounds, and case differences. Sort letter by letter and double-check.
• Putting the glossary or appendix in the wrong back-matter order. The standard sequence is appendix, endnotes, glossary, bibliography, index.
• Leaving appendices out of the table of contents. Every appendix gets a full TOC entry with its letter and title.
• Restarting page numbering in the appendix. Page numbers run straight through from chapter one to the index.
• In eBooks, building the glossary with text boxes, tables, or columns that shatter when the text reflows.

Frequently Asked Questions

What is glossary formatting in books?

Glossary formatting is the set of conventions for presenting a book’s alphabetical term list: bolded terms followed by em dashes, one-to-two-line definitions, hanging indents, alphabetical order, and placement in the back matter after the appendices and endnotes.

Where does the glossary go, before or after the appendix?

The standard order puts appendices first, then endnotes, then the glossary, followed by the bibliography and index. This is the sequence recommended by the Chicago Manual of Style and followed by most US trade publishers.

How long should glossary definitions be?

One or two lines, roughly twenty to forty words. A glossary is a quick-reference aid, not an encyclopedia. If a term genuinely needs a paragraph of explanation, define it in the main text instead.

Should eBook glossaries link back to the main text?

Linking terms in the text forward to their glossary entries is worth doing and readers love it. Linking every glossary entry back to each text occurrence is rarely necessary.

Do fiction books need a glossary or appendix?

Only when the book’s invented or specialized vocabulary would confuse readers. Epic fantasy, science fiction, and historical fiction use them often; most other fiction does not need either.

What is the difference between an appendix and an addendum?

An appendix is planned with the book and printed as part of it. An addendum is added later, usually to correct, update, or supplement an already published edition.

Conclusion: Finish Your Book Like a Publisher

A glossary and an appendix are small elements with outsized signaling power. Readers may never consciously notice yours, but their absence, or their sloppiness, registers immediately with reviewers, librarians, and anyone who buys nonfiction professionally. Alphabetize ruthlessly, define briefly, letter your appendices, keep the back-matter order straight, and test everything in both print and eBook form. Do that, and your book closes with the same authority it opened with.