diff --git a/inc/outbox.php b/inc/outbox.php
index 53b94e6..e0c0201 100644
--- a/inc/outbox.php
+++ b/inc/outbox.php
@@ -16,6 +16,7 @@ require_once plugin_dir_path( __FILE__ ) . '/activities/create.php';
 require_once plugin_dir_path( __FILE__ ) . '/activities.php';
 
 function handle_activity( $actor, $activity ) {
+    // TODO handle authentication/authorization
     if ( !array_key_exists( "type", $activity ) ) {
         return new \WP_Error(
             'invalid_activity',