An AI that answers from your documents is only as good as those documents. If the answer isn't written down clearly, the AI either can't find it or gives a vague one. The fix is mostly structure. Give each question its own heading, put the answer in the first sentence, and write part numbers and values into the text instead of leaving them in tables and diagrams.
You don't need a rewrite. These are the same changes that help a person skimming a PDF at 2am with a machine that won't heat. A few hours on the sections customers ask about most will do more than a month on the rest.
Why AI misses answers that are in the manual
Most AI support tools don't read your whole manual for every question. They split it into chunks, often a section or a few paragraphs each, and pull out the chunks that best match what the customer asked. If the answer is spread over three pages, or sits under a heading that doesn't match how people ask, the right chunk never gets picked.
So you're not really writing for an AI. You're writing so every section makes sense on its own.
Give each question its own heading
A section headed "Maintenance" that covers six jobs answers none of them well. Head each job the way a customer would ask about it: "Replacing the gasket", "The descale light won't go off", "Cleaning the steam wand". A section about one thing gets found for that thing.
Use real heading styles
Bold text that looks like a heading often isn't one to software. In Word or Google Docs, use the Heading 1, 2 and 3 styles. PDFs exported from them can keep that structure, and it's how tools tell where one section ends and the next begins.
Put the answer in the first sentence
Lead with the answer, then explain. "The descale light stays on until you hold the steam button for 5 seconds. This resets the counter..." An AI quoting the first sentence gives a complete answer. One quoting the third sentence gives a fragment.
Write part numbers into the text
Every part should carry its number at least once in the text, like "the group head gasket (GH-01)". Part numbers are what customers search for most exactly, and a number that only appears on a diagram can't be searched at all.
Use the same name every time, too. If it's the "group head gasket" on page 4 and the "brew seal" on page 30, someone searching for one won't find the other.
Spell out values and units
Write "58 mm", not "see table". Write "93°C for brewing", not "the usual temperature". Values that only live in a table on another page get separated from the sentence that needs them.
Say which model each section is for
If one manual covers the M2 and the M2 Pro, mark which model each section applies to. Otherwise an M2 owner can end up with the Pro's steps. A short line like "M2 Pro only" under the heading is enough.
Write troubleshooting as symptom, cause and fix
A table with those three columns is the most answerable thing you can write. Each row answers "why is it doing X?" on its own. Keep each cell a full sentence. "No steam", "Wand blocked by milk residue", "Soak the tip in hot water for 10 minutes, then clear the hole with the pin supplied."
Add a sentence next to every diagram
A labelled diagram is great for a person and invisible to search. Keep it, and add the sentence too. "The serial number is on the label under the drip tray." That one line answers one of the questions you get most.
Check your PDFs contain real text
A scanned manual is a set of pictures of pages. Try selecting a sentence in your PDF viewer. If you can't, there's no text for search to find. Re-export from the original file, or run it through OCR and check the part numbers afterwards. OCR often mixes up O and 0, or I and 1, and a wrong part number is worse than a missing one.
Split big manuals and name files clearly
A 300-page manual works. A manual per product, or per major section, gets found faster and lets you update one part without re-issuing the whole thing. Name each file for what it is: "M2 User Manual, 2026 edition", not "manual_final_v7".
Take old versions down
An outdated manual is worse than none. If the 2024 edition says hold the button for 3 seconds and the 2026 edition says 5, the AI may quote either. Remove old files, or mark them clearly as replaced.
When behaviour changes with a firmware update, say which version and what changed, in the manual itself. The answer to "why did this start after the update?" should be in the document, with a date.
Test it with real questions
Take your last twenty support emails and look for each answer in the manual. Anything you can't find in thirty seconds is the next section to fix. Do it again every month. The list shrinks fast.
Docutize indexes manuals as they are, by meaning and by part number, and shows which section each answer came from, so the sections that need work show up in what customers ask. How the help center works.