Author Addendum – An author addendum is a supplemental or added agreement to a publishing contract that defines or changes the terms of the contract, often focusing on the transfer of copyright ownership. For authors of scholarly works, an author addendum to a publisher’s standard publication contract may be necessary to help ensure that authors protect important rights, such as the right to post their articles online to a personal website or in a digital repository; the right to use their works within a classroom setting; or the right to use their works as the foundation for future research.