diff --git a/examples/sitemap/src/pages/index.js b/examples/sitemap/src/pages/index.js
index 496ae5d9ef96b..d87ec68cec241 100644
--- a/examples/sitemap/src/pages/index.js
+++ b/examples/sitemap/src/pages/index.js
@@ -4,10 +4,14 @@ const IndexRoute = () => (
   <div>
     <p>
       Welcome to the GatsbyJS Sitemap Demo. Visit{` `}
-      <a href="https://www.gatsbyjs.org/sitemap.xml">
+      <a href="/sitemap.xml">
         to see the generated sitemap.
       </a>
     </p>
+    <p>
+      Note: gatsby-plugin-sitemap uses <code>siteMetadata.siteUrl</code>{` `}
+      defined in gatsby-config.js to construct absolute URLs!
+    </p>
   </div>
 )