diff --git a/HISTORY.md b/HISTORY.md
index b1e2397a..b7543400 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -8,7 +8,9 @@ http://visjs.org
 
 - Fixed #1343: Connected edges are now deselected too when deselecting a node.
 
+### Timeline
 
+- Implemented option `multiselectPerGroup`. Thanks @hansmaulwurf23.
 
 
 ## 2015-01-01, version 4.9.0