diff --git a/utils/add_subjects.php b/utils/add_subjects.php
index 9c6b9ee..00a8039 100644
--- a/utils/add_subjects.php
+++ b/utils/add_subjects.php
@@ -27,12 +27,17 @@
 
 $query = $con->prepare('INSERT INTO subjects (friendly_name, calendar_name) VALUES (:friendly_name, :calendar_name)');
 foreach ($subjects as $subject) {
-  if (!isset($subject['friendly_name']) || !isset($subject['calendar_name']) || empty($subject['friendly_name']) || empty($subject['calendar_name'])) {
+  if (!isset($subject['calendar_name']) || empty($subject['calendar_name'])) {
     $con->rollback();
-    echo "The JSON file passed is malformed. It should be an array consisting of objects which have non-empty 'friendly_name' and 'calendar_name' properties.\n";
+    echo "The JSON file passed is malformed. It should be an array consisting of objects which have a non-empty 'calendar_name' property and optionally a 'friendly_name' property.\n";
     exit();
   }
 
+  if (!isset($subject['friendly_name']) || empty($subject['friendly_name']))
+    $subject['friendly_name'] = $subject['calendar_name'];
+
+  $subject['calendar_name'] = mb_strtolower($subject['calendar_name']);
+
   if (!$query->execute($subject)) {
     echo "An error occurred while adding the subject '".$subject['friendly_name']."' to the database. This doesn't affect the other subjects.\n";
   }