diff --git a/common/go.mod b/common/go.mod
new file mode 100644
index 0000000..8b8488b
--- /dev/null
+++ b/common/go.mod
@@ -0,0 +1,3 @@
+module github.com/ystv/streamer/common
+
+go 1.21
diff --git a/common/wsMessages/wsMessages.go b/common/wsMessages/wsMessages.go
new file mode 100644
index 0000000..db89c9c
--- /dev/null
+++ b/common/wsMessages/wsMessages.go
@@ -0,0 +1,11 @@
+package wsMessages
+
+type WSMessage string
+
+var (
+	Acknowledged WSMessage = "ACKNOWLEDGED"
+)
+
+func (r WSMessage) String() string {
+	return string(r)
+}