diff --git a/doc/common/section_compute-configure-vnc.xml b/doc/common/section_compute-configure-vnc.xml
index b13ccc1000..2128b4a107 100644
--- a/doc/common/section_compute-configure-vnc.xml
+++ b/doc/common/section_compute-configure-vnc.xml
@@ -8,6 +8,10 @@
   <para>The VNC proxy is an OpenStack component that enables compute
     service users to access their instances through VNC
     clients.</para>
+    <note><para>
+      The web proxy console URLs do not support the websocket
+      protocol scheme (ws://) on python versions less than 2.7.4.
+    </para></note>
   <para>The VNC console connection works as follows:</para>
   <orderedlist>
     <listitem>