diff --git a/docs/ScalabilityAndPerformance.xml b/docs/ScalabilityAndPerformance.xml
index 6eb23a203..db51e11f6 100644
--- a/docs/ScalabilityAndPerformance.xml
+++ b/docs/ScalabilityAndPerformance.xml
@@ -135,6 +135,20 @@
         role="bold">N</emphasis><superscript>2</superscript> scaling that is
         implicit in the problem being solved, it is vital to keep <emphasis
         role="bold">N</emphasis> small.</para>
+
+        <itemizedlist>
+          <listitem>
+            <para>If you have a large number of interfaces, use wild-cards
+            ("+") in <filename>/etc/shorewall/interfaces</filename> and
+            <filename>/etc/shorewall/hosts</filename> to reduce the number of
+            host groups.</para>
+          </listitem>
+
+          <listitem>
+            <para>Combine host groups with similar firewall requirements into
+            a single zone.</para>
+          </listitem>
+        </itemizedlist>
       </listitem>
     </itemizedlist>