diff --git a/docs/MultiISP.xml b/docs/MultiISP.xml
index 69af33361..9d9d31abc 100644
--- a/docs/MultiISP.xml
+++ b/docs/MultiISP.xml
@@ -36,6 +36,16 @@
     </legalnotice>
   </articleinfo>
 
+  <warning>
+    <para>Make sure you are<emphasis role="bold"> running a current,
+    vendor-supported distribution</emphasis>, before attempting to perform
+    this setup, older distributions do not meet the minimum requirements,and
+    you will need to recompile iptables, kernel and other software on your
+    system. If you don't follow this advice,<emphasis role="bold">we will
+    <emphasis role="bold">not</emphasis> be able to help you</emphasis>.
+    </para>
+  </warning>
+
   <section>
     <title>Multiple Internet Connection Support</title>