diff --git a/doc/manual/release-notes/rl-2.3.xml b/doc/manual/release-notes/rl-2.3.xml
index b0f7c8ec..a1f4a4b7 100644
--- a/doc/manual/release-notes/rl-2.3.xml
+++ b/doc/manual/release-notes/rl-2.3.xml
@@ -83,6 +83,11 @@ incompatible changes:</para>
     the duration of Nix function calls to stderr.</para>
   </listitem>
 
+  <listitem>
+    <para>On Linux, sandboxing is now disabled by default on systems
+    that don’t have the necessary kernel support.</para>
+  </listitem>
+
 </itemizedlist>
 
 </section>