Writing for Voice: The 29-Word Answer Principle
Voice search AEO focuses on the 29-word answer - an average length derived from how voice assistants (Google Assistant, Alexa, Siri) read featured snippet content aloud. Writing for voice searches means structuring your answer-first content to deliver a complete, standalone answer in the first 25–35 words, using natural spoken language (contractions, simple syntax, conversational tone) rather than formal written prose. The same content that wins voice citations also wins featured snippets for corresponding text queries - making voice optimization a multiplier on top of standard AEO content structure, not a separate strategy.
Voice vs Text Search: Key Differences
Three Voice Answer Formulas
S-A-P: Statement-Answer-Proof
State the question as a sentence, answer in 20–29 words, then provide one sentence of proof or source.
Example
'FAQ schema is implemented by adding FAQPage JSON-LD to your page head. Include each question in @type: Question with an acceptedAnswer. According to Google's structured data documentation, you must exactly match schema text to visible content.'
C-A-E: Condition-Answer-Example
State the condition under which the answer applies, give the 20-word answer, then an example.
Example
'For step-by-step guides where order matters, use HowTo schema instead of FAQPage. HowTo schema adds step entities that AI assistants can read as individual instructions. Example: a recipe guide uses HowTo for the cooking steps.'
Q-A: Direct question echo
Restate the question in the first sentence, then answer it in 25 words. The echo pattern signals to voice AI that this is a matched Q&A.
Example
'The best number of FAQ questions per page is 5–10 items. Under 5 questions rarely justifies FAQPage schema; over 15 signals thin content to Google's quality systems.'
Voice Readability Checklist
First sentence answers the question in under 35 words
Count words in sentence 1. If over 35, split into two sentences.
No passive voice in the first 2 sentences
'FAQ schema is added to your page' → 'Add FAQ schema to your page'. Active verbs are clearer spoken aloud.
Contractions used naturally
'You should not' → 'You shouldn't'. Contractions match spoken language cadence for voice delivery.
No em-dashes or semicolons in voice target sections
Replace em-dashes with commas or separate sentences. Voice platforms often pause incorrectly at em-dashes.
Numbers spelled naturally or as digits
Write '5' not 'five' for statistics. Write 'twenty-nine' for important round numbers if the spoken version is clearer.
Speakable schema marks the answer-first section
Add SpeakableSpecification with cssSelector targeting the answer-first paragraph class.
Speakable Schema: Marking Voice-Ready Content
SpeakableSpecification targeting answer-first paragraphs
{
"@context": "https://schema.org",
"@type": "Article",
"speakable": {
"@type": "SpeakableSpecification",
"cssSelector": [".answer-first-block", ".voice-answer"]
},
"name": "How to Add FAQ Schema to WordPress"
}
/* Target CSS class applied to your voice-ready sections */
<div class="answer-first-block">
<p>Add FAQ schema to WordPress using the Yoast SEO or RankMath plugin -
both auto-generate FAQPage JSON-LD from any FAQ block added in the
WordPress block editor on save.</p>
</div>Common Voice Writing Mistakes
Starting with 'According to...'
State the fact first, cite the source afterward. Voice assistants read attribution at the end, not the start.
Using jargon without definition in the answer sentence
Define the term in parentheses in the answer sentence, or use plain-language equivalents in the first 35-word block.
Answers over 200 words before the first period
Cap the voice-target answer paragraph at 3 sentences maximum. Depth belongs in the context paragraph that follows.
Relying on tables or lists for the primary answer
Voice assistants cannot read tables or formatted lists effectively. Your 25-word voice answer must be in prose, even if details follow in list format.