diff --git a/nixos/doc/manual/release-notes/rl-2009.xml b/nixos/doc/manual/release-notes/rl-2009.xml
index 8a2d1566018..19617f9aa13 100644
--- a/nixos/doc/manual/release-notes/rl-2009.xml
+++ b/nixos/doc/manual/release-notes/rl-2009.xml
@@ -1125,5 +1125,20 @@ services.transmission.settings.rpc-bind-address = "0.0.0.0";
      </para>
    </listitem>
   </itemizedlist>
+  <itemizedlist>
+   <listitem>
+    <para />
+    <para>
+        Kubernetes has been upgraded to 1.19.1, which also means that the
+        golang version to build it has been bumped to 1.15. This may have
+        consequences for your existing clusters and their certificates. Please
+        consider
+        <link xlink:href="https://relnotes.k8s.io/?markdown=93264">
+            the release notes for Kubernetes 1.19 carefully
+        </link>
+        before upgrading.
+    </para>
+   </listitem>
+  </itemizedlist>
  </section>
 </section>