diff --git a/README.md b/README.md
index 3bc019c..d4b307c 100644
--- a/README.md
+++ b/README.md
@@ -1172,7 +1172,7 @@ var newObject = deepClone(obj);
 
 ```javascript
 function deepClone(object){
-	var newObject = {};
+	var newObject = Array.isArray(object) ? [] : {};
 	for(var key in object){
 		if(typeof object[key] === 'object'  && object[key] !== null ){
 		 newObject[key] = deepClone(object[key]);
@@ -1201,6 +1201,8 @@ var personalDetail = {
 ```
 So when we do deep clone then we should copy every property (including the nested object).
 
+Without `Array.isArray()` check, `[1, 2, 3]` was silently cloned as `{ "0": 1, "1": 2, "2": 3 }` since both arrays and objects return `"object"` for `typeof`,fixed by initializing `newObject` as `[]` when the input is an array
+
 </details>
 
 ## Question 30. Best way to detect `undefined` object property in JavaScript.