diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..84db0f5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/goburrow/modbus
+
+go 1.16
+
+require github.com/goburrow/serial v0.1.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..6cb2ac4
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/goburrow/serial v0.1.0 h1:v2T1SQa/dlUqQiYIT8+Cu7YolfqAi3K96UmhwYyuSrA=
+github.com/goburrow/serial v0.1.0/go.mod h1:sAiqG0nRVswsm1C97xsttiYCzSLBmUZ/VSlVLZJ8haA=