diff --git a/types/vis/index.d.ts b/types/vis/index.d.ts
index 0f4a4f0f4e..84ff769270 100644
--- a/types/vis/index.d.ts
+++ b/types/vis/index.d.ts
@@ -11,6 +11,7 @@
 //                 Oleksii Kachura <https://github.com/alex-kachura>
 //                 dcop <https://github.com/dcop>
 //                 Avraham Essoudry <https://github.com/avrahamcool>
+//                 Dmitriy Trifonov <https://github.com/divideby>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 import { MomentInput, MomentFormatSpecification, Moment } from 'moment';
@@ -244,6 +245,7 @@ export interface TimelineOptions {
   multiselectPerGroup?: boolean;
   onAdd?: TimelineOptionsItemCallbackFunction;
   onAddGroup?: TimelineOptionsGroupCallbackFunction;
+  onInitialDrawComplete?: (() => void);
   onUpdate?: TimelineOptionsItemCallbackFunction;
   onMove?: TimelineOptionsItemCallbackFunction;
   onMoveGroup?: TimelineOptionsGroupCallbackFunction;