diff --git a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
index 96cb5187889fa..6b706e4aeaa16 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
@@ -524,6 +524,15 @@
           <link linkend="opt-services.ananicy.enable">services.ananicy</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://github.com/prometheus-community/smartctl_exporter">smartctl_exporter</link>,
+          a Prometheus exporter for
+          <link xlink:href="https://en.wikipedia.org/wiki/S.M.A.R.T.">S.M.A.R.T.</link>
+          data. Available as
+          <link xlink:href="options.html#opt-services.prometheus.exporters.smartctl.enable">services.prometheus.exporters.smartctl</link>.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-21.11-incompatibilities">
diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index 584bde952a2af..48adc4ad33cba 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -147,6 +147,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - Auto nice daemons [ananicy](https://github.com/Nefelim4ag/Ananicy) and [ananicy-cpp](https://gitlab.com/ananicy-cpp/ananicy-cpp/). Available as [services.ananicy](#opt-services.ananicy.enable).
 
+- [smartctl_exporter](https://github.com/prometheus-community/smartctl_exporter), a Prometheus exporter for [S.M.A.R.T.](https://en.wikipedia.org/wiki/S.M.A.R.T.) data. Available as [services.prometheus.exporters.smartctl](options.html#opt-services.prometheus.exporters.smartctl.enable).
+
 ## Backward Incompatibilities {#sec-release-21.11-incompatibilities}
 
 - The NixOS VM test framework, `pkgs.nixosTest`/`make-test-python.nix`, now requires detaching commands such as `succeed("foo &")` and `succeed("foo | xclip -i")` to close stdout.