add email description

booking.regn_form.inc

@@ -485,6 +485,9 @@ function booking_form($node, &$form_state, $inserting = FALSE)
   $form['contact-details']['booking_email'] = array(
     '#type' => 'textfield',
     '#title' => t('E-mail address'),
+    '#description' => t('Please note that we will use this email address to contact you with important information about !event.', array(
+      '!event' => $event->booking_eventname
+    )),    
     '#maxlength' => 100,
     '#required' => TRUE,
     '#default_value' => !empty($data->booking_email) ? $data->booking_email : ''