diff --git a/examples/full-setup-tf-upgrade/tgw/variables.vpc-transit-gateway.tf b/examples/full-setup-tf-upgrade/tgw/variables.vpc-transit-gateway.tf
index 0d3f659..e8d3a54 100644
--- a/examples/full-setup-tf-upgrade/tgw/variables.vpc-transit-gateway.tf
+++ b/examples/full-setup-tf-upgrade/tgw/variables.vpc-transit-gateway.tf
@@ -109,7 +109,7 @@ variable "tgw_label" {
   default     = "prod"
 
   validation {
-    condition     = contains(["sa", "prod"], var.tgw_label)
+    condition     = contains(["sa", "prod", "nonprod"], var.tgw_label)
     error_message = "tgw_label must be set to valid environment, used in determining managed prefixes"
   }
 }