Addendum is the fifth studio album by American musician John Maus, released on April 20, 2018. It is a twelve-track collection that serves as an "addendum" to his previous album Screen Memories (2017). As Maus explained, "It was really more that I made an album, but then I realized I had two albums worth of stuff." Accordingly, the songs on Addendum were made in a more "carefree" manner than Screen Memories and are most resemblant of his usual style.