diff --git a/HISTORY.md b/HISTORY.md
index a9ed5d4d..6ae704a5 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -4,6 +4,9 @@ http://visjs.org
 
 ## not yet released, version 4.7.1-SNAPSHOT
 
+### Timeline
+
+- Implemented reordering groups by dragging them vertically. Thanks @hansmaulwurf23.