diff --git a/README.md b/README.md
index 938a609..43563c0 100644
--- a/README.md
+++ b/README.md
@@ -140,7 +140,7 @@ module "bigquery_loader_pubsub" {
 | <a name="input_name"></a> [name](#input\_name) | A name which will be pre-pended to the resources created | `string` | n/a | yes |
 | <a name="input_network"></a> [network](#input\_network) | The name of the network to deploy within | `string` | n/a | yes |
 | <a name="input_project_id"></a> [project\_id](#input\_project\_id) | The project ID in which the stack is being deployed | `string` | n/a | yes |
-| <a name="input_network_project_id"></a> [network\_project\_id](#input\_network\_project\_id) | The project ID of the shared VPC in which the stack is being deployed | `string` | n/a | yes |
+| <a name="input_network_project_id"></a> [network\_project\_id](#input\_network\_project\_id) | The project ID of the shared VPC in which the stack is being deployed | `string` | `""` | no |
 | <a name="input_region"></a> [region](#input\_region) | The name of the region to deploy within | `string` | n/a | yes |
 | <a name="input_accept_limited_use_license"></a> [accept\_limited\_use\_license](#input\_accept\_limited\_use\_license) | Acceptance of the SLULA terms (https://docs.snowplow.io/limited-use-license-1.0/) | `bool` | `false` | no |
 | <a name="input_app_version"></a> [app\_version](#input\_app\_version) | App version to use. This variable facilitates dev flow, the modules may not work with anything other than the default value. | `string` | `"1.7.0"` | no |