creating new OU under Root

[daskabe]

Hi, I am trying to create a new OU under root. But not sure what to put for parent. In aws console i already have root and few OU under it that i created manually.
Thank you for this helpful repo.

    const organization = Organization.of(scope, "Organization");
    organization.principal; // The AWS IAM organization principal

    // Create an organizational unit (OU)
    const organizationUnit = new OrganizationalUnit(this, "OrganizationalUnit", {
      organizationalUnitName: "MyFirstOU",
      parent: organization <--------???? 
    });

maybe its better to make parent a conditional param. and if its not specified new OrganizationalUnit() should just create the new org under root.