diff --git a/demo_xml.php b/demo_xml.php
index b91bbdb..44bf3e3 100644
--- a/demo_xml.php
+++ b/demo_xml.php
@@ -1,11 +1,12 @@
 <?php
 $response_format="xml";
+$key='demo';
 $link="http://www.mediafire.com/?wfghxg5x7d159x8";
 $api = 'http://api.urlchecker.net/';
 $ch = curl_init($api);
 
 curl_setopt($ch, CURLOPT_POST, true);
-curl_setopt($ch, CURLOPT_POSTFIELDS, "response_format=$response_format&link=$link");
+curl_setopt($ch, CURLOPT_POSTFIELDS, "response_format=$response_format&key=$key&link=$link");
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_VERBOSE, 1);
 curl_setopt($ch, CURLOPT_NOBODY, 0);