Using Cloudformation to Create DynamoDB with composite primary key

From the command line or the online API, I have no trouble creating a "composite primary key" but when I try to use CloudFormation to do the job for me, I don't see any JSON/YAML that will let me set something called a "composite primary key". The language is completely different so I was hoping someone could guide me as to how I create such a key using Cloudformation.

My best guess is something like the following where I want the composite key to consist of both userId and noteId:

  Resources:
    usersTable:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: notes_serverless
        AttributeDefinitions:
          - AttributeName: userId
            AttributeType: S
          - AttributeName: noteId
            AttributeType: S
        KeySchema:
          - AttributeName: userId
            KeyType: HASH
          - AttributeName: noteId
            KeyType: RANGE
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1