diff --git a/types/undertaker/index.d.ts b/types/undertaker/index.d.ts
index bd483c2b6a..d5c21ddf52 100644
--- a/types/undertaker/index.d.ts
+++ b/types/undertaker/index.d.ts
@@ -1,6 +1,8 @@
 // Type definitions for undertaker 1.2
 // Project: https://github.com/gulpjs/undertaker
-// Definitions by: Qubo <https://github.com/tkqubo>, Giedrius Grabauskas <https://github.com/GiedriusGrabauskas>
+// Definitions by: Qubo <https://github.com/tkqubo>
+//                 Giedrius Grabauskas <https://github.com/GiedriusGrabauskas>
+//                 Evan Yamanishi <https://github.com/sh0ji>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 import * as Registry from "undertaker-registry";