diff --git a/src/sammo/WebUtil.php b/src/sammo/WebUtil.php
index c4798b78..2ceaab80 100644
--- a/src/sammo/WebUtil.php
+++ b/src/sammo/WebUtil.php
@@ -21,6 +21,7 @@ class WebUtil
     {
         if (!headers_sent()) {
             header('Expires: Wed, 01 Jan 2014 00:00:00 GMT');
+            header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
             header('Cache-Control: no-store, no-cache, must-revalidate');
             header('Cache-Control: post-check=0, pre-check=0', false);
             header('Pragma: no-cache');