Documentation

docs/setup/setting-up-navigation.md

@@ -31,6 +31,16 @@ are rebound automatically, i.e., __Material for MkDocs now behaves like a Single
 Page Application__. Now, the search index survives navigation, which is
 especially useful for large documentation sites.
 
+!!! info "The [`site_url`][mkdocs.site_url] setting must be set"
+
+    Note that you must set [`site_url`][mkdocs.site_url] when using instant
+    navigation, as instant navigation relies on the generated `sitemap.xml`
+    which will be empty if this setting is omitted. Example:
+
+    ``` yaml
+    site_url: https://example.com
+    ```
+
   [XHR]: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
 
 #### Instant prefetching
@@ -108,6 +118,16 @@ theme:
     - navigation.instant.preview
 ```
 
+!!! info "The [`site_url`][mkdocs.site_url] setting must be set"
+
+    Note that you must set [`site_url`][mkdocs.site_url] when using instant
+    previews, as instant previews rely on the generated `sitemap.xml`
+    which will be empty if this setting is omitted. Example:
+
+    ``` yaml
+    site_url: https://example.com
+    ```
+
 ### Anchor tracking
 
 <!-- md:version 8.0.0 -->

includes/mkdocs.md

@@ -4,6 +4,7 @@
   [mkdocs.env]: https://www.mkdocs.org/user-guide/configuration/#environment-variables
   [mkdocs.docs_dir]: https://www.mkdocs.org/user-guide/configuration/#docs_dir
   [mkdocs.site_dir]: https://www.mkdocs.org/user-guide/configuration/#site_dir
+  [mkdocs.site_url]: https://www.mkdocs.org/user-guide/configuration/#site_url
   [mkdocs.site_description]: https://www.mkdocs.org/user-guide/configuration/#site_description
   [mkdocs.nav]: https://www.mkdocs.org/user-guide/configuration/#nav
   [mkdocs.plugins]: https://www.mkdocs.org/user-guide/configuration/#plugins