Clarify custom frontmatter fields are not added to HTML head (#1894)

devin-ai-integration[bot] · devalog · web-flow · commit 6753dd18da55 · 2025-11-10T14:38:00.000-05:00
Co-authored-by: Devin AI &lt;158243242+devin-ai-integration[bot]@users.noreply.github.com&gt;
Co-authored-by: Devin Logan &lt;devinannlogan@gmail.com&gt;
diff --git a/fern/products/docs/pages/customization/frontmatter.mdx b/fern/products/docs/pages/customization/frontmatter.mdx
@@ -16,7 +16,7 @@ subtitle: Set titles, add meta descriptions, and more
 slug: frontmatter
 description: Use frontmatter to set the page title, subtitle, slug, meta description, its OpenGraph image, and a URL to suggest edits.
 keywords: frontmatter, seo, customization, metadata
-og:sitename: Your Company Inc.
+og:site_name: Your Company Inc.
 og:title: SEO Metadata Title
 ---
 ```
diff --git a/fern/snippets/seo-metadata-page.mdx b/fern/snippets/seo-metadata-page.mdx
@@ -1,3 +1,7 @@
+<Info>
+Only the documented SEO fields are added to the HTML `<head>` as meta tags. Custom frontmatter fields won't automatically appear in your page metadata. To add custom metadata, use [custom JavaScript](/learn/docs/customization/custom-css-js#custom-javascript).
+</Info>
+
 <CodeBlock title="plantstore-quickstart.mdx">
 ```mdx
 ---

-Original file line number
+Diff line change
@@ @@ -1,3 +1,7 @@ @@
 +<Info>
 +Only the documented SEO fields are added to the HTML `<head>` as meta tags. Custom frontmatter fields won't automatically appear in your page metadata. To add custom metadata, use [custom JavaScript](/learn/docs/customization/custom-css-js#custom-javascript).
 +</Info>
++
 <CodeBlock title="plantstore-quickstart.mdx">
 ```mdx
 ---