diff --git a/lib.php b/lib.php
index e7dd0aa..5cbbf0d 100644
--- a/lib.php
+++ b/lib.php
@@ -69,4 +69,11 @@ public function get_listing($path = '', $page = '') {
         $ret['nologin'] = true;
         return $ret;
     }
+
+    /**
+     * This plugin supports only web images.
+     */
+    public function supported_filetypes() {
+        return ['web_image'];
+    }
 }