diff --git a/google_sitemap/config_install-party.xml b/google_sitemap/config_install-party.xml
index 4443efd2..59454928 100644
--- a/google_sitemap/config_install-party.xml
+++ b/google_sitemap/config_install-party.xml
@@ -4,8 +4,12 @@
   store_into="/var/www/install-party/sitemap.xml.gz"
   verbose="1"
   >
-  <url  href="http://install-party.ens-cachan.fr/" />
-
+  <url
+       href="http://install-party.ens-cachan.fr/"
+       lastmod="2006-05-12T09:43:00+02:00"
+       priority="1"
+  />
+			
   <sitemap    path="/var/www/install-party/sitemap.xml.gz" />
 
   <filter  action="drop"  type="wildcard"  pattern="*~"           />