diff --git a/docs/MultiISP.xml b/docs/MultiISP.xml
index 82151be62..f7070a261 100644
--- a/docs/MultiISP.xml
+++ b/docs/MultiISP.xml
@@ -188,6 +188,14 @@
             set HIGH_ROUTE_MARKS=Yes (PROVIDER_OFFSET > 0 with Shorewall
             4.4.26 and later) in
             <filename>/etc/shorewall/shorewall.conf</filename>.</para>
+
+            <note>
+              <para>In Shorewall 4.4.26, the HIGH_ROUTE_MARKS and
+              WIDE_TC_MARKS options in
+              <filename>/etc/shorewall/shorewall.conf</filename> were replaced
+              by the PROVIDER_OFFSET and TC_BITS options. Look <ulink
+              url="PacketMarking.html#Values">here</ulink> for details.</para>
+            </note>
           </listitem>
 
           <listitem>