diff --git a/lib/main.mlx b/lib/main.mlx
index 6209cc4..af50884 100644
--- a/lib/main.mlx
+++ b/lib/main.mlx
@@ -205,6 +205,18 @@ let q_and_a = [
 [JSX.string "$ opam pin add dune --dev-repo"]
 </Code>
     </div>
+  ; "How does the nightly differ from the preview?",
+    <div class_="flex flex-col gap-2">
+      <p>"Like the nightly, the preview was a binary build created every day from the most current Dune sources. However, it also enabled certain optional features by default."</p>
+      <p>
+        <ul>
+	  <li><var>"DUNE_CONFIG__PORTABLE_LOCK_DIRS"</var>" has been incorporated into mainline Dune, it is always enabled."</li>
+	  <li><var>"DUNE_CONFIG__PKG_BUILD_PROGRESS"</var>" has been incorporated into mainline Dune, it is enabled when running Dune with "<code>"--display=short"</code>"."</li>
+	  <li><var>"DUNE_CONFIG__LOCK_DEV_TOOL"</var>" is not enabled anymore but can still be set in the environment. To use dev-tools use "<code>"dune tools"</code>" while we work for better support for dev-tools."</li>
+	</ul>
+      </p>
+      <p>"The re-branded nightly builds now just follow Dune's "<pre>"main"</pre>" branch with no additional features enabled."</p>
+    </div>
 ]
 
 let faq () =