diff --git a/app.js b/app.js
index 0d2a380..c1c82aa 100644
--- a/app.js
+++ b/app.js
@@ -1,5 +1,9 @@
-function sum(num1, num2) {
-    return num1 + num2;
+function greeting() {
+    let message = 'Hello';
+    let sayHi = function hi() {
+        let message = 'Hi';
+    };
+    sayHi();
+    console.log(message); // Hello as 'Hi' is out of scope
 }
-let result = sum(2,3);
-console.log(result);
\ No newline at end of file
+greeting();
\ No newline at end of file