diff --git a/booking.variety_form.inc b/booking.variety_form.inc
index 2aca303..759baf4 100644
--- a/booking.variety_form.inc
+++ b/booking.variety_form.inc
@@ -6,11 +6,13 @@
  * NOTE: This feature is not complete
  */
 
-
+/**
+ * Build the user-facing variety session registration form
+ */
 function booking_variety_regn_form($node, &$form_state)
 {
   global $event;
-  $form = array ();
+  $form = array();
   $data = $node;
 
   // Query the variety timeslot table
@@ -20,9 +22,6 @@ function booking_variety_regn_form($node, &$form_state)
     ->orderBy('v.booking_variety_start');
   $result = $timeslot_query->execute();            
 
-  //$form['#prefix'] = '<div id="booking_variety_session_form_wrapper">';
-  //$form['#suffix'] = '</div>'; 
-
   $form['identity'] = array(
     '#type' => 'fieldset',
     '#title' => 'Select Person',
@@ -118,7 +117,7 @@ function booking_variety_session_form_callback($form, &$form_state) {
 }
 
 /**
- * Validate the submission 
+ * Validate the submission for the user-facing variety session registration form
  */
 function booking_variety_regn_form_validate($form, &$form_state) {
 	global $event;
@@ -159,7 +158,7 @@ function booking_variety_regn_form_validate($form, &$form_state) {
     array(':nid' => $values['booking_nid']));
 
   if ($query_already_registered) {
-    form_set_error('booking_nid', t('You have already registered for variety sessions.'));
+    form_set_error('booking_nid', t('You have already registered for variety sessions. Existing registration cannot be changed.'));
   }
 
   // --- Check there is still space available in the selected variety sessions ---
@@ -198,7 +197,7 @@ function booking_variety_regn_form_validate($form, &$form_state) {
 }
 
 /**
- * Process the submission 
+ * Process the submission for the user-facing variety session registration form
  */
 function booking_variety_regn_form_submit($form, &$form_state) {
 	global $event;