diff --git a/node-webkit/node-webkit.d.ts b/node-webkit/node-webkit.d.ts
index 81129274dc..3a9533875b 100644
--- a/node-webkit/node-webkit.d.ts
+++ b/node-webkit/node-webkit.d.ts
@@ -156,7 +156,7 @@ declare module "nw.gui" {
         eval(frame: HTMLIFrameElement, script: string): void;
     }
 
-    export interface App {
+    export interface App extends EventEmitter {
         argv: any;
         fullArgv: any;
         dataPath: string;
@@ -199,7 +199,7 @@ declare module "nw.gui" {
         menu?: Menu;
     }
 
-    export class Tray implements TrayOption {
+    export class Tray extends EventEmitter implements TrayOption {
         constructor(option: TrayOption);
         title: string;
         tooltip: string;
diff --git a/trayballoon/trayballoon-tests.ts b/trayballoon/trayballoon-tests.ts
new file mode 100644
index 0000000000..dab23777e0
--- /dev/null
+++ b/trayballoon/trayballoon-tests.ts
@@ -0,0 +1,15 @@
+/// <reference path="trayballoon.d.ts" />
+
+import trayballoon = require( "trayballoon" );
+
+function testTrayballoon() {
+    trayballoon( {
+        text: "text",
+        title: "title",
+        icon: "icon",
+        timeout: 5000,
+        wait: true
+    }, () => {
+
+    } );
+}
diff --git a/trayballoon/trayballoon.d.ts b/trayballoon/trayballoon.d.ts
new file mode 100644
index 0000000000..c60ffed40b
--- /dev/null
+++ b/trayballoon/trayballoon.d.ts
@@ -0,0 +1,17 @@
+// Type definitions for trayballoon
+// Project: https://github.com/sindresorhus/trayballoon
+// Definitions by: André Eckardt <https://github.com/korve>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare interface TrayballoonOptions {
+    text:string
+    title?:string
+    icon?:string
+    timeout?:number
+    wait?:boolean
+}
+
+declare function trayballoonFn( opts:TrayballoonOptions, fn:Function ): void;
+declare module "trayballoon" {
+    export = trayballoonFn;
+}
\ No newline at end of file