diff --git a/chapters/config.xml b/chapters/config.xml
index 5dd0b62b86..f5ccb493db 100644
--- a/chapters/config.xml
+++ b/chapters/config.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.101 $ -->
+<!-- $Revision: 1.102 $ -->
  <chapter id="configuration">
   <title>Configuration</title>
 
@@ -120,6 +120,12 @@ php_value auto_prepend_file none
           </programlisting>
          </informalexample>
         </para>
+	<note>
+	 <simpara>
+	  Don't use <literal>php_value</literal> to set boolean values.
+	  <literal>php_flag</literal> (see below) should be used instead.
+	 </simpara>
+	</note>
        </listitem>
       </varlistentry>
       <varlistentry>