diff --git a/doc/manual/release-notes.xml b/doc/manual/release-notes.xml
index 6ead46e6e7..14ab378e20 100644
--- a/doc/manual/release-notes.xml
+++ b/doc/manual/release-notes.xml
@@ -16,6 +16,33 @@ features:</para>
 
 <itemizedlist>
 
+  <listitem>
+    <para>Syntactic sugar for writing nested attribute sets.  Instead of
+
+<programlisting>
+{
+  foo = {
+    bar = 123;
+    xyzzy = true;
+  };
+  a = { b = { c = "d"; }; };
+}
+</programlisting>
+
+    you can write
+
+<programlisting>
+{
+  foo.bar = 123;
+  foo.xyzzy = true;
+  a.b.c = "d";
+}
+</programlisting>
+
+    This is useful, for instance, in NixOS configuration files.</para>
+    
+  </listitem>
+
   <listitem>
     <para>Support for Nix channels generated by Hydra, the Nix-based
     continuous build system.  (Hydra generates NAR archives on the