diff --git a/vpc-transit-gateway-association/peer/README.md b/vpc-transit-gateway-association/peer/README.md
index 154c226..b3ff8d0 100644
--- a/vpc-transit-gateway-association/peer/README.md
+++ b/vpc-transit-gateway-association/peer/README.md
@@ -109,6 +109,7 @@ No modules.
 | <a name="input_vpc_index"></a> [vpc\_index](#input\_vpc\_index) | VPC index number (integer starting at 1) | `number` | `null` | no |
 | <a name="input_vpc_name"></a> [vpc\_name](#input\_vpc\_name) | VPC name component used through the VPC descrbing its purpose (ex: dice-dev) | `string` | `null` | no |
 | <a name="input_vpc_short_name"></a> [vpc\_short\_name](#input\_vpc\_short\_name) | VPC short name component (vpc{index}) | `string` | `null` | no |
+| <a name="input_vpn_route_prefix_list_name"></a> [vpn\_route\_prefix\_list\_name](#input\_vpn\_route\_prefix\_list\_name) | Shared prefix list name used for routing to TGW through VPN.  If null, existing VPN routing if any will be used. | `string` | `null` | no |
 
 ## Outputs
 
diff --git a/vpc-transit-gateway-association/peer/variables.tf b/vpc-transit-gateway-association/peer/variables.tf
index 0656be0..e107346 100644
--- a/vpc-transit-gateway-association/peer/variables.tf
+++ b/vpc-transit-gateway-association/peer/variables.tf
@@ -35,6 +35,12 @@ variable "route_prefix_list_name" {
   default     = "transit-gateway.prod"
 }
 
+variable "vpn_route_prefix_list_name" {
+  description = "Shared prefix list name used for routing to TGW through VPN.  If null, existing VPN routing if any will be used."
+  type        = string
+  default     = null
+}
+
 variable "transit_gateway_label" {
   description = "Transit Gateway label for specific instance (sa, prod)"
   type        = string
diff --git a/vpc-transit-gateway-association/self/README.md b/vpc-transit-gateway-association/self/README.md
index 3c203df..b377a4e 100644
--- a/vpc-transit-gateway-association/self/README.md
+++ b/vpc-transit-gateway-association/self/README.md
@@ -116,6 +116,7 @@ module "vpc_tgw_self" {
 | <a name="input_vpc_index"></a> [vpc\_index](#input\_vpc\_index) | VPC index number (integer starting at 1) | `number` | `null` | no |
 | <a name="input_vpc_name"></a> [vpc\_name](#input\_vpc\_name) | VPC name component used through the VPC descrbing its purpose (ex: dice-dev) | `string` | `null` | no |
 | <a name="input_vpc_short_name"></a> [vpc\_short\_name](#input\_vpc\_short\_name) | VPC short name component (vpc{index}) | `string` | `null` | no |
+| <a name="input_vpn_route_prefix_list_name"></a> [vpn\_route\_prefix\_list\_name](#input\_vpn\_route\_prefix\_list\_name) | Shared prefix list name used for routing to TGW through VPN.  If null, existing VPN routing if any will be used. | `string` | `null` | no |
 
 ## Outputs
 
diff --git a/vpc-transit-gateway-association/self/variables.tf b/vpc-transit-gateway-association/self/variables.tf
index 0656be0..e107346 100644
--- a/vpc-transit-gateway-association/self/variables.tf
+++ b/vpc-transit-gateway-association/self/variables.tf
@@ -35,6 +35,12 @@ variable "route_prefix_list_name" {
   default     = "transit-gateway.prod"
 }
 
+variable "vpn_route_prefix_list_name" {
+  description = "Shared prefix list name used for routing to TGW through VPN.  If null, existing VPN routing if any will be used."
+  type        = string
+  default     = null
+}
+
 variable "transit_gateway_label" {
   description = "Transit Gateway label for specific instance (sa, prod)"
   type        = string