diff --git a/types/plotly.js/index.d.ts b/types/plotly.js/index.d.ts
index 3ee0440844..6cd34bc4ef 100644
--- a/types/plotly.js/index.d.ts
+++ b/types/plotly.js/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://plot.ly/javascript/
 // Definitions by: Chris Gervang <https://github.com/chrisgervang>, Martin Duparc <https://github.com/martinduparc>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
 
 declare namespace Plots {
     interface StaticPlots {