diff --git a/examples/full-cluster-tf-upgrade/1.31/addons/addon_vpc-cni.tf b/examples/full-cluster-tf-upgrade/1.31/addons/addon_vpc-cni.tf
index a6b44e4..a42ac92 100644
--- a/examples/full-cluster-tf-upgrade/1.31/addons/addon_vpc-cni.tf
+++ b/examples/full-cluster-tf-upgrade/1.31/addons/addon_vpc-cni.tf
@@ -9,6 +9,18 @@ resource "aws_eks_addon" "vpc-cni" {
   # note OVERWRITE resets to eks addon defaults, PRESERVE uses any values set here
   resolve_conflicts_on_create = "OVERWRITE"
   resolve_conflicts_on_update = "OVERWRITE"
+
+  # https://aws.amazon.com/blogs/containers/amazon-vpc-cni-introduces-enhanced-subnet-discovery/
+  # add tag to subnets for discovery
+  #                     "kubernetes.io/role/cni" = 1
+  #
+  #  configuration_values = jsonencode({
+  #    env = {
+  #      ENABLE_SUBNET_DISCOVERY = "true"
+  #      WARM_IP_TARGET          = "1"
+  #      MINIMUM_IP_TARGET       = "1"
+  #    }
+  #  })
 }
 
 
diff --git a/examples/full-cluster-tf-upgrade/1.31/import.tf b/examples/full-cluster-tf-upgrade/1.31/import.tf.off
similarity index 100%
rename from examples/full-cluster-tf-upgrade/1.31/import.tf
rename to examples/full-cluster-tf-upgrade/1.31/import.tf.off