diff --git a/jquery-sortable/jquery-sortable.d.ts b/jquery-sortable/jquery-sortable.d.ts
index b416dfb8e..ce47a5900 100644
--- a/jquery-sortable/jquery-sortable.d.ts
+++ b/jquery-sortable/jquery-sortable.d.ts
@@ -88,6 +88,7 @@ declare module JQuerySortable {
 	}
 
 	interface Options extends GroupOptions, ContainerOptions {
+		group?: string;
 	}
 }