diff --git a/doc/arm/notes.xml b/doc/arm/notes.xml
index af20651d7d..700070f959 100644
--- a/doc/arm/notes.xml
+++ b/doc/arm/notes.xml
@@ -380,6 +380,12 @@
 	  if mapped IPv4 addresses can be used.
 	</para>
       </listitem>
+      <listitem>
+	<para>
+	  <command>nslookup</command> will now look up IPv6 as well
+	  as IPv4 addresses by default. [RT #40420]
+	</para>
+      </listitem>
       <listitem>
 	<para>
 	  <option>serial-update-method</option> can now be set to