diff --git a/docs/reference/site-config.md b/docs/reference/site-config.md
index 1cf9d726..f23082f8 100644
--- a/docs/reference/site-config.md
+++ b/docs/reference/site-config.md
@@ -645,6 +645,23 @@ export default {
}
```
+#### Example: Adding a canonical URL ``
+
+```ts
+export default {
+ transformHead({ page }) {
+ // Skip the 404 page
+ if (page !== '404.md') {
+ const canonicalUrl = `https://example.com/${page}`
+ .replace(/index\.md$/, '')
+ .replace(/\.md$/, '.html')
+
+ return [['link', { rel: 'canonical', href: canonicalUrl }]]
+ }
+ }
+}
+```
+
### transformHtml
- Type: `(code: string, id: string, context: TransformContext) => Awaitable`