diff --git a/src/main/php/web/NotFound.class.php b/src/main/php/web/NotFound.class.php
index f95da364..74761388 100755
--- a/src/main/php/web/NotFound.class.php
+++ b/src/main/php/web/NotFound.class.php
@@ -3,6 +3,12 @@
 class NotFound extends Error {
   public $path;
 
+  /**
+   * Creates a "Not Found" error
+   *
+   * @param  string $path
+   * @param  ?lang.Throwable $cause
+   */
   public function __construct($path, $cause= null) {
     parent::__construct(404, 'Cannot find '.$path, $cause);
     $this->path= $path;