diff --git a/types/lazy.js/index.d.ts b/types/lazy.js/index.d.ts
index 0cb6ce2f95..e7cc3f8fed 100644
--- a/types/lazy.js/index.d.ts
+++ b/types/lazy.js/index.d.ts
@@ -1,7 +1,10 @@
-// Type definitions for Lazy.js 0.3.4
+// Type definitions for Lazy.js 0.5.1
 // Project: https://github.com/dtao/lazy.js/
-// Definitions by: Bart van der Schoor <https://github.com/Bartvds>, Mike Doughty <https://github.com/miso440>
+// Definitions by: Bart van der Schoor <https://github.com/Bartvds>
+//                 Mike Doughty <https://github.com/miso440>
+//                 Gabriel Lorquet <https://github.com/gablorquet>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 declare namespace LazyJS {
     interface LazyStatic {
@@ -168,7 +171,7 @@ declare namespace LazyJS {
       toArray(): T[];
       toObject(): any;
       union(var_args: T[]): Sequence<T>;
-      uniq(): Sequence<T>;
+      uniq(key?: keyof T): Sequence<T>;
       where(properties: any): Sequence<T>;
       without(...var_args: T[]): Sequence<T>;
       without(var_args: T[]): Sequence<T>;
@@ -284,4 +287,4 @@ declare namespace LazyJS {
   declare module 'lazy.js' {
     export = Lazy;
   }
-  
\ No newline at end of file
+