diff --git a/doc/manual/release-notes/rl-2.1.xml b/doc/manual/release-notes/rl-2.1.xml
index 5f37083ee..c628d04a7 100644
--- a/doc/manual/release-notes/rl-2.1.xml
+++ b/doc/manual/release-notes/rl-2.1.xml
@@ -28,6 +28,12 @@ new features:</para>
     than 5 GiB.</para>
   </listitem>
 
+  <listitem>
+    <para>The S3 binary cache store now supports uploading to
+    S3-compatible services with the <literal>endpoint</literal>
+    option.</para>
+  </listitem>
+
   <listitem>
     <para>The flag <option>--fallback</option> is no longer required
     to recover from disappeared NARs in binary caches.</para>