diff --git a/airtime_mvc/application/configs/constants.php b/airtime_mvc/application/configs/constants.php
index 548fa1fd3..790a52ecb 100644
--- a/airtime_mvc/application/configs/constants.php
+++ b/airtime_mvc/application/configs/constants.php
@@ -11,7 +11,7 @@ define('COMPANY_SITE_URL'   , 'http://sourcefabric.org/');
 define('WHOS_USING_URL'             , 'http://sourcefabric.org/en/airtime/whosusing');
 define('TERMS_AND_CONDITIONS_URL'   , 'http://www.sourcefabric.org/en/about/policy/');
 define('PRIVACY_POLICY_URL'         , 'http://www.sourcefabric.org/en/about/policy/');
-define('USER_MANUAL_URL'            , 'http://sourcefabric.booktype.pro/airtime-25-for-broadcasters/');
+define('USER_MANUAL_URL'            , 'http://sourcefabric.booktype.pro/airtime-pro-for-broadcasters');
 
 define('LICENSE_VERSION'    , 'GNU AGPL v.3');
 define('LICENSE_URL'        , 'http://www.gnu.org/licenses/agpl-3.0-standalone.html');