src/feeds/posts.njk

@@ -1,5 +1,5 @@
 ---
-permalink: /feeds/posts
+permalink: /feeds/posts.xml
 layout: null
 eleventyExcludeFromCollections: true
 excludeFromSitemap: true

src/pages/feeds.html

@@ -7,7 +7,7 @@ description: Feed yourself a veritable bevy of feeds.
 <p>Here is my collection of feeds for your perusal. They come in RSS varieties.</p>
 <ul>
     <li>
-        <a href="/feeds/posts">Posts</a>
+        <a href="/feeds/posts.xml">Posts</a>
         <p>Just the posts.</p>
     </li>
 </ul>