Add phpdoc comment

src/UNL/Catalog.php

@@ -387,6 +387,11 @@ class UNL_Catalog
         return $course_data;
     }
 
+    /**
+     * Allow retrieving the course renderer (Savvy) with template paths set
+     *
+     * @return Savvy
+     */
     protected function getCourseRenderer()
     {
         static $savvy = false;