diff --git a/nixos/doc/manual/release-notes/rl-1803.xml b/nixos/doc/manual/release-notes/rl-1803.xml
index d5150d25d37..ee4a54aa46c 100644
--- a/nixos/doc/manual/release-notes/rl-1803.xml
+++ b/nixos/doc/manual/release-notes/rl-1803.xml
@@ -18,6 +18,13 @@
 has the following highlights: </para>
 
 <itemizedlist>
+  <listitem>
+    <para>
+      Nix now defaults to 2.0; see its
+      <link xlink:href="https://nixos.org/nix/manual/#ssec-relnotes-2.0">release notes</link>.
+    </para>
+  </listitem>
+
   <listitem>
     <para>
       Linux kernel defaults to the 4.14 branch (it was 4.9).