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 # sample-cf
 A sample AWS CloudFormation template
+
+## control-tower-client-vpc.yaml
+Example of VPC template to replace default VPC created by Control Tower. This is
+loosely based on the VPC template used by the Landing Zones solution. It creates
+one public and two private subnets, each divided between two AZs, as well as an 
+Internet Gateway for the public subnet and a VPC Flow Log. Actual VPC CIDR 
+assignment and subnet IPs are parameterized. This is intended for use as a StackSet
+to deploy to multiple client accounts, wherein each client account gets a different
+parameter set to define it's VPC IP range.
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