diff --git a/examples/typescript-001/src/app/app.tsx b/examples/typescript-001/src/app/app.tsx
index be0ac0d..962b794 100644
--- a/examples/typescript-001/src/app/app.tsx
+++ b/examples/typescript-001/src/app/app.tsx
@@ -2,9 +2,15 @@ import { useSnapshot } from 'valtio';
 import { proxyWithHistory } from 'valtio-history';
 import React from 'react';
 
-const textProxy = proxyWithHistory({
-  text: 'Add some text to this initial value and then undo/redo',
-});
+const textProxy = proxyWithHistory(
+  {
+    text: 'Add some text to this initial value and then undo/redo',
+  },
+  {
+    subscribeCallback: (ops, historySaved) =>
+      console.log({ ops, historySaved }),
+  }
+);
 const update = (event: React.ChangeEvent<HTMLTextAreaElement>) =>
   (textProxy.value.text = event.target.value);