diff --git a/reference/apc/reference.xml b/reference/apc/reference.xml
index f5ea6d00d3..885cec46c3 100644
--- a/reference/apc/reference.xml
+++ b/reference/apc/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
 <reference id="ref.apc">
  <title>Alternative PHP Cache</title>
  <titleabbrev>APC</titleabbrev>
@@ -26,6 +26,12 @@
    <para>
     &pecl.windows.download;
    </para>
+   <note>
+    <simpara>
+     On Windows, APC expects <literal>c:\tmp</literal> to exist, and be
+     writable by the web server.
+    </simpara>
+   </note>
   </section>
                
   &reference.apc.ini;