diff --git a/vpc-subnets/README.md b/vpc-subnets/README.md
index 250910e..d345280 100644
--- a/vpc-subnets/README.md
+++ b/vpc-subnets/README.md
@@ -10,4 +10,5 @@ default-tags = {
     "project" = "project1"
     "application" = "network"
 }
+vpc-cidr="172.16.0.0/16"
 ```