diff --git a/lib/SimpleSAML/XHTML/TemplateLoader.php b/lib/SimpleSAML/XHTML/TemplateLoader.php
index 3b95d6e364bf0a8d9c6c16593b956153c332b600..e24dd2700a5e55b4c9f49ea1b2f114c6846c5e6b 100644
--- a/lib/SimpleSAML/XHTML/TemplateLoader.php
+++ b/lib/SimpleSAML/XHTML/TemplateLoader.php
@@ -3,7 +3,12 @@
 
 namespace SimpleSAML\XHTML;
 
-
+/**
+ * This class extends the Twig\Loader\FilesystemLoader so that we can load templates from modules in twig, even
+ * when the main template is not part of a module (or the same one).
+ *
+ * @package simplesamlphp/simplesamlphp
+ */
 class TemplateLoader extends \Twig\Loader\FilesystemLoader
 {
     /**