updated readme

aws/modules/infrastructure_modules/vpc/README.md

@@ -100,7 +100,7 @@ downstream module: https://github.com/cloudposse/terraform-aws-vpc-flow-logs-s3-
 | <a name="icmp_alert_capacity"></a> [icmp\_alert\_capacity](#icmp\_alert\_capacity) | Capacity for ICMP alert rule group | `number` | `100` | no |
 | <a name="tls_alert_capacity"></a> [tls\_alert\_capacity](#tls\_alert\_capacity) | Capacity for TLS alert rule group | `number` | `100` | no |
 | <a name="domain_allow_capacity"></a> [domain\_allow\_capacity](#domain\_allow\_capacity) | Capacity for Domain allow rule group | `number` | `100` | no |
-
+| <a name="firewall_endpoint_per_az"></a> [firewall\_endpoint\_per\_az](#firewall\_endpoint\_per_\az) | Whether to create a firewall endpoint per-AZ or just use one. Note: There are running costs associated with Firewall Endpoints. For Production-like environments this should be true | `bool` | `true` | no |
 
 ## Outputs