Build an Index
A 200-page report without an index is a maze — readers flip pages hunting for terms you could have pointed them to directly. Word builds the index for you from entries you mark as you write, then compiles them into an alphabetized list with page numbers. The habit takes seconds per term and saves hours at the end. Pair with footnotes and mail merge for fully professional documents.
TL;DR / Quick Fix
Quick fix: a Word index is built from marked entries — select a term, mark it, and Word collects every occurrence into an alphabetized list at the end. Mark terms as you write, not after finishing. The upfront habit saves hours of hunting through pages later.
Follow these steps
- Mark entries as you write. Select an important term, go to References, Mark Entry. Do this when the term is fresh — marking after finishing means rereading the whole document.
- Mark the main entries. Focus on real topics, names, and concepts readers will look up. Marking every other word produces an index nobody uses.
- Use subentries for detail. Under a main entry like networks, add subentries like wireless and wired. Subentries turn a flat list into a genuinely useful map.
- Insert the index. Place the cursor where the index belongs — usually near the end — and choose Insert Index from the References tab. Word compiles every marked entry automatically.
- Update before finishing. After final edits, right-click the index and update it. Page numbers shift during editing; the index must be refreshed last.
- Format for readability. Two columns, clear headings, and consistent capitalization make the index scannable. A wall of single-column text defeats the purpose.
What NOT to do
- Do not mark entries after finishing. You will miss terms and hate the reread — mark as you go.
- Do not index everything. An index with a thousand trivial entries is as useless as no index at all.
- Do not forget to update the index last. Edits move page numbers; a stale index points readers to wrong pages.
- Do not confuse an index with a table of contents. The contents list headings; the index lists topics — documents often need both.
Frequently asked questions
How is an index different from a table of contents?
A table of contents lists your headings in order; an index lists topics alphabetically with page numbers. Long documents benefit from both.
Can Word index phrases?
Yes — mark multi-word phrases as single entries. Readers look up concepts, not just single words.
Do I need special formatting?
No. Marking entries adds hidden codes; your visible text stays exactly as it was.