diff --git a/express/lib/sum.js b/express/lib/sum.js
new file mode 100644
index 0000000..0025287
--- /dev/null
+++ b/express/lib/sum.js
@@ -0,0 +1,7 @@
+// Adds 2 numbers together and returns the sum.
+
+function sum(a, b) {
+	console.log(a+b);	
+	return a + b;
+}
+