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llms.txt and schema markup, explained simply

The AI-readiness basics every site should have — what llms.txt and schema are, and how to add them without a developer.

By the Ralf team · 17 June 2026 · 7 min read
llms.txt is a simple text file you place at yoursite.com/llms.txt that points AI crawlers to your most important pages in plain language. Schema markup (structured data) is code you add to your pages that labels what each thing is — a business, an article, an FAQ, a product. Together they make your site easier for AI engines to read, understand and cite.

Key takeaways

  • llms.txt is a short, plain-language map of your best content for AI crawlers.
  • Schema labels your content so engines know what each thing actually is.
  • Neither guarantees a citation — but both remove reasons not to cite you.
  • You can add both without a developer; Ralf can generate and check them for you.

What is llms.txt?

llms.txt is a proposed standard — a single Markdown file at the root of your site (/llms.txt) that lists your most important pages with a one-line description of each, so AI crawlers can find and understand your best content quickly. Think of it as a curated table of contents written for language models. It complements, rather than replaces, your robots.txt and XML sitemap.

What does an llms.txt file look like?

It’s plain Markdown — a title, a short summary, then grouped links:

# Ralf
> The AI-first SEO platform — track your visibility across AI
> engines, fix technical SEO, and earn citations.

## Guides
- [What is AEO?](https://ralfhq.com/blog/what-is-aeo): Answer Engine Optimization, explained.
- [Get cited by ChatGPT](https://ralfhq.com/blog/get-cited-by-chatgpt): The step-by-step playbook.

## Product
- [Search](https://ralfhq.com/search): AI visibility + technical SEO.
- [Pricing](https://ralfhq.com/pricing): Plans from $49/mo.

What is schema markup (structured data)?

Schema markup is code — usually JSON-LD — that you add to a page to label its content using the shared vocabulary at schema.org. It tells engines “this is an article, published on this date, by this organisation” or “this is an FAQ, and here are the questions and answers.” Humans see a normal page; machines get an unambiguous description.

Which schema types matter most for AEO?

Schema typeWhat it labels
Organization / LocalBusinessWho you are — name, logo, location, contact
Article / BlogPostingContent pages, with author and date
FAQPageQuestion-and-answer content (great for AEO)
ProductProducts, with price and availability
BreadcrumbListWhere a page sits in your site structure

This very page uses Article, FAQPage and BreadcrumbList schema.

How do you add llms.txt and schema without a developer?

  • llms.txt: create a plain text file like the example above and upload it to your site’s root folder. Many platforms let you do this without code.
  • Schema: most site builders and CMS plugins can output basic schema; for anything custom it’s a small block of JSON-LD in the page head.
  • Or let Ralf handle it: Site Health checks whether your llms.txt and schema are present and correct, flags what’s missing, and — when Content is enabled — can add the markup for you.
FAQ

Questions, answered plainly.

Do I need an llms.txt file? Is it official?
llms.txt is an emerging, community-proposed standard rather than an official requirement, and not every engine reads it yet. It's low-effort to add and makes your key content easy for AI crawlers to find, so it's worth having.
Does schema markup guarantee I'll be cited?
No. Schema doesn't force a citation, but it removes ambiguity about what's on your page, which makes engines more confident quoting you. It's a foundation, not a magic switch.
What's the difference between llms.txt and schema?
llms.txt is a site-level map that points crawlers to your best pages; schema is page-level code that labels what's on each individual page. They work together — one aids discovery, the other aids understanding.
Will adding these slow my site down?
No. An llms.txt file is tiny plain text, and schema is a small block of code in the page head. Neither has a meaningful effect on load time.

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