diff --git a/types/leaflet.polylinemeasure/index.d.ts b/types/leaflet.polylinemeasure/index.d.ts
index 134b459ed1..ea647b1266 100644
--- a/types/leaflet.polylinemeasure/index.d.ts
+++ b/types/leaflet.polylinemeasure/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/ppete2/Leaflet.PolylineMeasure#readme
 // Definitions by: Rinat Sultanov <https://github.com/RiON69>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 import * as L from 'leaflet';