Citizenship is not a field that the U.S. Copyright Office updates on a registered certificate, because it is not a required field.According to the Copyright Office, "Citizenship can be important when a work has been published in a country other than the U.S. because it can affect our ability to make a registration. However, the work in question was published in the U.S., so we do not need information about the citizenship of the author in order to establish copyrightability."A Supplementary Registration Tutorial video is available on the copyright website About Supplementary Registration to correct or amplify a copyright certificate after issuance. You can view Fees for this service under the Supplementary Registrations section on the Fees webpage.To contact the Copyright Office, please call (877) 476–0778 or visit their website at www.copyright.gov.