---
AWSTemplateFormatVersion: "2010-09-09"
Description: >
  Custom required property
Resources:
  myS3Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: "my-bucket-name"
  untaggedInstance:
    Type: AWS::EC2::Instance
    Properties:
      ImageId: ami-123456
  VPC:
      Type: AWS::EC2::VPC
      Properties:
        CidrBlock: "127.0.0.1/32"