diff --git a/gio/gfile.c b/gio/gfile.c
index 1cc69166a..f2ef3e86d 100644
--- a/gio/gfile.c
+++ b/gio/gfile.c
@@ -6934,6 +6934,7 @@ query_default_handler_query_info_cb (GObject      *object,
 /**
  * g_file_query_default_handler_async:
  * @file: a #GFile to open
+ * @io_priority: the [I/O priority][io-priority] of the request
  * @cancellable: optional #GCancellable object, %NULL to ignore
  * @callback: (nullable): a #GAsyncReadyCallback to call when the request is done
  * @user_data: (nullable): data to pass to @callback