diff --git a/09_Day/09_day_higher_order_functions.md b/09_Day/09_day_higher_order_functions.md
index 407579c..ddfb0d5 100644
--- a/09_Day/09_day_higher_order_functions.md
+++ b/09_Day/09_day_higher_order_functions.md
@@ -63,7 +63,7 @@ function cube(callback, n) {
   return callback(n) * n
 }
 ​
-console.log(cube(square, 3))
+console.log(cube(callBack, 3))
 ```
 
 ### Returning function
@@ -581,4 +581,4 @@ console.log(users); // sorted ascending
 
 🎉 CONGRATULATIONS ! 🎉
   
-[<< Day 8](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/08_Day/08_day_objects.md) | [Day 10 >>](#)
\ No newline at end of file
+[<< Day 8](https://github.com/Asabeneh/30DaysOfJavaScript/blob/master/08_Day/08_day_objects.md) | [Day 10 >>](#)