diff --git a/Documentation/Examples/Calculations/Database/DPRODUCT.php b/Documentation/Examples/Calculations/Database/DPRODUCT.php
new file mode 100644
index 00000000..e5e629ed
--- /dev/null
+++ b/Documentation/Examples/Calculations/Database/DPRODUCT.php
@@ -0,0 +1,87 @@
+<?php
+
+error_reporting(E_ALL);
+set_time_limit(0);
+
+date_default_timezone_set('Europe/London');
+
+
+?>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+
+<title>PHPExcel Calculation Examples</title>
+
+</head>
+<body>
+
+<h1>DPRODUCT</h1>
+<h2>Multiplies the values in a column of a list or database that match conditions that you specify.</h2>
+<?php
+
+/** Include path **/
+set_include_path(get_include_path() . PATH_SEPARATOR . '../../../../Classes/');
+
+/** Include PHPExcel */
+include 'PHPExcel.php';
+
+
+// Create new PHPExcel object
+$objPHPExcel = new PHPExcel();
+$worksheet = $objPHPExcel->getActiveSheet();
+
+// Add some data
+$database = array( array( 'Tree',  'Height', 'Age', 'Yield', 'Profit' ),
+                   array( 'Apple',  18,       20,    14,      105.00  ),
+                   array( 'Pear',   12,       12,    10,       96.00  ),
+                   array( 'Cherry', 13,       14,     9,      105.00  ),
+                   array( 'Apple',  14,       15,    10,       75.00  ),
+                   array( 'Pear',    9,        8,     8,       76.80  ),
+                   array( 'Apple',   8,        9,     6,       45.00  ),
+                 );
+$criteria = array( array( 'Tree',      'Height', 'Age', 'Yield', 'Profit', 'Height' ),
+                   array( '="=Apple"', '>10',    NULL,  NULL,    NULL,     '<16'    ),
+                   array( '="=Pear"',  NULL,     NULL,  NULL,    NULL,     NULL     )
+                 );
+
+$worksheet->fromArray( $criteria, NULL, 'A1' );
+$worksheet->fromArray( $database, NULL, 'A4' );
+
+$worksheet->setCellValue('A12', 'The product of the yields of all Apple trees over 10\' in the orchard');
+$worksheet->setCellValue('B12', '=DPRODUCT(A4:E10,"Yield",A1:B2)');
+
+
+
+echo '<hr />';
+
+
+echo '<h4>Database</h4>';
+
+$databaseData = $worksheet->rangeToArray('A4:E10',null,true,true,true);
+var_dump($databaseData);
+
+
+echo '<hr />';
+
+
+// Test the formulae
+echo '<h4>Criteria</h4>';
+
+echo 'ALL' . '<br /><br />';
+
+echo $worksheet->getCell("A12")->getValue() .'<br />';
+echo 'DMAX() Result is ' . $worksheet->getCell("B12")->getCalculatedValue() .'<br /><br />';
+
+echo '<h4>Criteria</h4>';
+
+$criteriaData = $worksheet->rangeToArray('A1:A2',null,true,true,true);
+var_dump($criteriaData);
+
+echo $worksheet->getCell("A13")->getValue() .'<br />';
+echo 'DMAX() Result is ' . $worksheet->getCell("B13")->getCalculatedValue();
+
+
+?>
+<body>
+</html>
\ No newline at end of file
diff --git a/Documentation/PHPExcel developer documentation.doc b/Documentation/PHPExcel developer documentation.doc
index 75ed7c6f..434a7107 100644
Binary files a/Documentation/PHPExcel developer documentation.doc and b/Documentation/PHPExcel developer documentation.doc differ
