diff --git a/types/match-sorter/index.d.ts b/types/match-sorter/index.d.ts
index fbb92c9909..dd4f5bc5a7 100644
--- a/types/match-sorter/index.d.ts
+++ b/types/match-sorter/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: Claas Ahlrichs <https://github.com/claasahl>
 //                 Christian Ruigrok <https://github.com/chrisru>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 declare namespace matchSorter {
     namespace rankings {