diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..e733b01 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,5 +1,9 @@
-const sumAll = function() {
-
+const sumAll = function(a, b) {
+    let sum = 0;
+    for (let i = a; i <= b; i++) {
+        sum += i;
+    }
+    return sum;
 };
 
 // Do not edit below this line
diff --git a/05_sumAll/sumAll.spec.js b/05_sumAll/sumAll.spec.js
index 1a9fb7c..e2f1c95 100644
--- a/05_sumAll/sumAll.spec.js
+++ b/05_sumAll/sumAll.spec.js
@@ -4,7 +4,7 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test('works with large numbers', () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
   test.skip('works with larger number first', () => {