diff --git a/yosay/yosay-tests.ts b/yosay/yosay-tests.ts
new file mode 100644
index 000000000..257b546ea
--- /dev/null
+++ b/yosay/yosay-tests.ts
@@ -0,0 +1,3 @@
+/// <reference path="./yosay.d.ts" />
+import yosay = require('yosay');
+yosay('Welcome to the generator!', {maxLength: 20});
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diff --git a/yosay/yosay.d.ts b/yosay/yosay.d.ts
new file mode 100644
index 000000000..a46049e10
--- /dev/null
+++ b/yosay/yosay.d.ts
@@ -0,0 +1,9 @@
+// Type definitions for yosay
+// Project: https://github.com/yeoman/yosay
+// Definitions by: Kentaro Okuno <http://github.com/armorik83>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'yosay' {
+  function yosay(message?: string, options?: {maxLength: number}): string;
+  export = yosay;
+}
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