diff --git a/Shorewall-docs2/ping.xml b/Shorewall-docs2/ping.xml
index a7fc7dfdf..efd02ea10 100644
--- a/Shorewall-docs2/ping.xml
+++ b/Shorewall-docs2/ping.xml
@@ -32,6 +32,13 @@
     </legalnotice>
   </articleinfo>
 
+  <caution>
+    <para><emphasis role="bold">This article applies to Shorewall 3.0 and
+    later. If you are running a version of Shorewall earlier than Shorewall
+    3.0.0 then please see the documentation for that
+    release.</emphasis></para>
+  </caution>
+
   <note>
     <para>Enabling <quote>ping</quote> will also enable ICMP-based
     <emphasis>traceroute</emphasis>. For UDP-based traceroute, see the <ulink