diff --git a/05-sumAll/README.md b/05-sumAll/README.md
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+# Exercise 05 - sumAll
+
+Implement a function that takes 2 integers and returns the sum of every number between(and including) them:
+
+```javascript
+sumAll(1, 4) // returns the sum of 1 + 2 + 3 + 4 which is 10
+```
\ No newline at end of file
diff --git a/05-sumAll/sumAll.js b/05-sumAll/sumAll.js
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+var sumAll = function() {
+
+}
+
+module.exports = sumAll
diff --git a/05-sumAll/sumAll.spec.js b/05-sumAll/sumAll.spec.js
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+var sumAll = require('./sumAll')
+
+describe('sumAll', function() {
+  it('sums numbers within the range', function() {
+    expect(sumAll(1, 4)).toEqual(10);
+  });
+  xit('works with large numbers', function() {
+    expect(sumAll(1, 4000)).toEqual(8002000);
+  });
+  xit('works with larger number first', function() {
+    expect(sumAll(123, 1)).toEqual(7626);
+  });
+  xit('returns ERROR with negative numbers', function() {
+    expect(sumAll(-10, 4)).toEqual('ERROR');
+  });
+  xit('returns ERROR with non-number parameters', function() {
+    expect(sumAll(10, "90")).toEqual('ERROR');
+  });
+  xit('returns ERROR with non-number parameters', function() {
+    expect(sumAll(10, [90, 1])).toEqual('ERROR');
+  });
+});