diff --git a/parsecsv.lib.php b/parsecsv.lib.php
index c405f03..b18d95c 100644
--- a/parsecsv.lib.php
+++ b/parsecsv.lib.php
@@ -459,7 +459,12 @@ class parseCSV {
 
         if ( $filename !== null ) {
             header('Content-type: application/csv');
-            header('Content-Disposition: attachment; filename="'.$filename.'"');
+            header('Content-Length: '.strlen($data));
+            header('Cache-Control: no-cache, must-revalidate');
+            header('Pragma: no-cache');
+            header('Expires: 0');
+            header('Content-Disposition: attachment; filename="'.$filename.'"; modification-date="'.date('r').'";');
+
             echo $data;
         }