diff --git a/calculator.go b/calculator.go
new file mode 100644
index 0000000..8d1a042
--- /dev/null
+++ b/calculator.go
@@ -0,0 +1,12 @@
+package calculator
+
+func Add(x, y int) int {
+	return x + y
+}
+
+func Subtract(x, y int) int {
+	/*
+	   large comment
+	*/
+	return x - y
+}