name : add-custom-attributes.rst **To add a custom attribute** This example adds a custom attribute CustomAttr1 to a user pool. It is a String type, and requires a minimum of 1 character and a maximum of 15. It is not required. Command:: aws cognito-idp add-custom-attributes --user-pool-id us-west-2_aaaaaaaaa --custom-attributes Name="CustomAttr1",AttributeDataType="String",DeveloperOnlyAttribute=false,Required=false,StringAttributeConstraints="{MinLength=1,MaxLength=15}"