@@ -1,13 +1,21 @@
 // Predict and explain first...
+
+// Prediction: I predict that the function will return undefined
+// because return stops the function before a + b can be calculated.
+
 //  =============> write your prediction here
 
 function sum(a, b) {
-  return;
-  a + b;
+  return a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
+// Explanation: The original code used return on its own line.
+// When JavaScript reaches return, the function stops and returns
+// undefined. The line a + b is therefore never used.
+// We need to return a + b together.
+
 // =============> write your explanation here
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+// =============> write your new code here