diff --git a/calendar/classes/export_form.php b/calendar/classes/export_form.php
index e5d2e161c6a..487c59567cb 100644
--- a/calendar/classes/export_form.php
+++ b/calendar/classes/export_form.php
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-/*
+/**
  * The mform for exporting calendar events
  *
  * @package core_calendar
@@ -22,16 +22,13 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
 
 // Always include formslib.
-if (!defined('MOODLE_INTERNAL')) {
-    die('Direct access to this script is forbidden.');    // It must be included from a Moodle page.
-}
-
 require_once($CFG->dirroot.'/lib/formslib.php');
 
 /**
- * The mform class for creating and editing a calendar
+ * The mform class for exporting a calendar
  *
  * @copyright 2014 Brian Barnes
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
@@ -87,4 +84,4 @@ class core_calendar_export_form extends moodleform {
         $buttons[] = $mform->createElement('submit', 'export', get_string('exportbutton', 'calendar'));
         $mform->addGroup($buttons);
     }
-}
\ No newline at end of file
+}