diff --git a/packer/vars/cloud-env.json.example b/packer/vars/cloud-env.json.example
new file mode 100644
index 0000000..dc1c08f
--- /dev/null
+++ b/packer/vars/cloud-env.json.example
@@ -0,0 +1,3 @@
+{
+  "subnet_id": "subnet-NNNNNNNN"
+}