diff --git a/types/update-notifier/index.d.ts b/types/update-notifier/index.d.ts
index 11f6e5616e..98c71d87f6 100644
--- a/types/update-notifier/index.d.ts
+++ b/types/update-notifier/index.d.ts
@@ -1,17 +1,21 @@
-// Type definitions for update-notifier 2.0
+// Type definitions for update-notifier 2.2
 // Project: https://github.com/yeoman/update-notifier
-// Definitions by: vvakame <https://github.com/vvakame>, Noah Chen <https://github.com/nchen63>
+// Definitions by: vvakame <https://github.com/vvakame>
+//                 Noah Chen <https://github.com/nchen63>
+//                 Jason Dreyzehner <https://github.com/bitjson>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 export = UpdateNotifier;
 
-declare function UpdateNotifier(settings?: UpdateNotifier.Settings): UpdateNotifier.UpdateNotifier;
+declare function UpdateNotifier(
+    settings?: UpdateNotifier.Settings
+): UpdateNotifier.UpdateNotifier;
 
 declare namespace UpdateNotifier {
     class UpdateNotifier {
         constructor(settings?: Settings);
 
-        update: UpdateInfo;
+        update?: UpdateInfo;
         check(): void;
         checkNpm(): void;
         notify(customMessage?: NotifyOptions): void;
@@ -19,7 +23,7 @@ declare namespace UpdateNotifier {
 
     interface Settings {
         pkg?: Package;
-        callback?(update?: UpdateInfo): any;
+        callback?(error: Error | null, update?: UpdateInfo): any;
         packageName?: string;
         packageVersion?: string;
         updateCheckInterval?: number; // in milliseconds, default 1000 * 60 * 60 * 24 (1 day)
diff --git a/types/update-notifier/update-notifier-tests.ts b/types/update-notifier/update-notifier-tests.ts
index fc55c3286a..c09fcf556a 100644
--- a/types/update-notifier/update-notifier-tests.ts
+++ b/types/update-notifier/update-notifier-tests.ts
@@ -1,16 +1,16 @@
-import UpdateNotifier = require("update-notifier");
+import UpdateNotifier = require('update-notifier');
 
 let notifier = UpdateNotifier();
 
 if (notifier.update) {
-	notifier.notify();
+    notifier.notify();
 }
 
 console.log(notifier.update);
 
 // Also exposed as a class
 notifier = new UpdateNotifier.UpdateNotifier({
-	updateCheckInterval: 1000 * 60 * 60 * 24 * 7 // 1 week
+    updateCheckInterval: 1000 * 60 * 60 * 24 * 7 // 1 week
 });
 
 if (notifier.update) {
@@ -27,7 +27,22 @@ if (notifier.update) {
             margin: 1,
             align: 'center',
             borderColor: 'yellow',
-            borderStyle: 'round',
-        },
+            borderStyle: 'round'
+        }
     });
 }
+
+// Using the callback option
+notifier = new UpdateNotifier.UpdateNotifier({
+    callback: (err, update) => {
+        if (err) throw err;
+        if (update) {
+            console.log(
+                update.current,
+                update.latest,
+                update.name,
+                update.type
+            );
+        }
+    }
+});