diff --git a/sum.js b/sum.js
index d5ae479..8b6d159 100644
--- a/sum.js
+++ b/sum.js
@@ -2,4 +2,9 @@ function sum(a, b) {
   something = a * b;
   return a + b;
 }
+
+function prod(a, b) {
+  return a * b;
+}
+
 module.exports = sum;