diff --git a/enrol/authorize/index.php b/enrol/authorize/index.php
index e30e9d47244..fde08f99906 100644
--- a/enrol/authorize/index.php
+++ b/enrol/authorize/index.php
@@ -1,18 +1,21 @@
 <?PHP // $Id$
 
+/// Load libraries
     require_once '../../config.php';
     require_once 'lib.php';
 
+/// Get site
     if (! $site = get_site()) {
         error("Could not find a site!");
     }
 
+/// Only site users can access to this page
     require_login();
-
     if (isguest()) {
         error("Guests cannot use this page.");
     }
 
+/// Load strings. All strings should be defined here. lib.php uses these strings.
     $strs = get_strings(array('user','status','action','delete','time','course','confirm','yes','no','none','error'));
     $authstrs = get_strings(array('paymentmanagement','orderid','void','capture','refund','delete',
                 'authcaptured','authorizedpendingcapture','capturedpendingsettle','capturedsettled',
@@ -20,18 +23,22 @@
                 'transid','settlementdate','notsettled','amount',
                 'howmuch','captureyes','unenrolstudent'), 'enrol_authorize');
 
+/// Print header
     print_header("$site->shortname: $authstrs->paymentmanagement",
                  "$site->fullname",
                  "<a href=\"index.php\">$authstrs->paymentmanagement</a>", "");
 
+/// Get order id
     $orderid = optional_param('order', 0, PARAM_INT);
 
-    if (!empty($orderid)) {
-        print_authorize_order_details($orderid);
-    }
-    else {
+/// If orderid is empty, user wants to see all orders
+    if (empty($orderid)) {
         print_authorize_orders();
     }
+    else {
+        print_authorize_order_details($orderid);
+    }
 
+/// Print footer
     print_footer();
 ?>