diff --git a/FeedExpander.md b/FeedExpander.md
index 9b4bc80..c520c85 100644
--- a/FeedExpander.md
+++ b/FeedExpander.md
@@ -94,6 +94,7 @@ class MySiteBridge extends FeedExpander {
 	const URI = '';
 	const DESCRIPTION = 'No description provided';
 	const PARAMETERS = array();
+	const CACHE_TIMEOUT = 3600;
 
     public function collectData(){
         $this->collectExpandableDatas('your feed URI');