diff --git a/09_Day/09_day_higher_order_functions.md b/09_Day/09_day_higher_order_functions.md
index 407579c..167c754 100644
--- a/09_Day/09_day_higher_order_functions.md
+++ b/09_Day/09_day_higher_order_functions.md
@@ -95,7 +95,7 @@ const sumArray = arr => {
   const callBack = function(element) {
     sum += element
   }
-  numbers.forEach(callback)
+  numbers.forEach(callBack)
   return sum
   
 }
@@ -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 >>](#)