diff --git a/admin_manual/configuration_server/harden_server.rst b/admin_manual/configuration_server/harden_server.rst
index 940fecf3c..392717614 100644
--- a/admin_manual/configuration_server/harden_server.rst
+++ b/admin_manual/configuration_server/harden_server.rst
@@ -119,7 +119,7 @@ VirtualHost file:
 
   <VirtualHost *:443>
      ServerName cloud.owncloud.com
-     Header always add Strict-Transport-Security "max-age=15768000"
+     Header always add Strict-Transport-Security "max-age=15768000; includeSubDomains; preload"
   </VirtualHost>
 
 It shall be noted that this requires that the ``mod_headers`` extension to be installed.