Glossary
lastmod
A sitemap field indicating when a URL last meaningfully changed.
Definition
Honest lastmod values help crawlers prioritize recrawls after content updates.
In practice
- Use precise language on public pages so assistants and crawlers share the same meaning
- Pair definitions with crawlable HTML, metadata, and intentional robots policy
- Measure outcomes (mentions, citations, pillar scores) after you change signals
See also
Next step
Browse the glossary index, read what is AI visibility?, or measure your site.
Related
FAQ
What is lastmod?
A sitemap field indicating when a URL last meaningfully changed.
Why does lastmod matter for AI visibility?
Honest lastmod values help crawlers prioritize recrawls after content updates.
How can BatSignal help?
BatSignal measures crawl access, content readiness, ChatGPT presence, and related signals so teams can improve AI visibility with evidence—not guesswork.