diff --git a/inc/actions.php b/inc/actions.php
index d3eff18b77774ec043ba71c64084046eccc9ff07..d7c51282f40188b8ba03025b4c1288523362ad9b 100644
--- a/inc/actions.php
+++ b/inc/actions.php
@@ -356,6 +356,9 @@ function act_export($act){
   global $ID;
   global $REV;
 
+  // search engines: never cache exported docs! (Google only currently)
+  header('X-Robots-Tag: noindex');
+
   // no renderer for this
   if($act == 'export_raw'){
     header('Content-Type: text/plain; charset=utf-8');