diff --git a/reference/pdo/reference.xml b/reference/pdo/reference.xml
index 32befb4fab..780fa24252 100644
--- a/reference/pdo/reference.xml
+++ b/reference/pdo/reference.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.58 $ -->
+<!-- $Revision: 1.59 $ -->
 <!-- Purpose: database.abstract -->
 <!-- Membership: pecl, bundled -->
 
@@ -198,6 +198,15 @@ $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass, array(
      </programlisting>
      </example>
     </para>
+    <note>
+     <para>
+      If you wish to use persistent connections, you must set 
+      <constant>PDO::ATTR_PERSISTENT</constant> in the array of driver options
+      passed to the PDO constructor. If setting this attribute with
+      <xref linkend="function.PDO-setAttribute" /> after instantiation of the 
+      object, the driver will not use persistent connections.
+     </para>
+    </note>
     <note>
      <para>
       If you're using the PDO ODBC driver and your ODBC libraries support ODBC