Just in time to celebrate its first anniversary, the Smithsonian’s National Museum of African American History and Culture has included a display featuring Justice Clarence Thomas, one of the U.S. Supreme Court’s conservative stalwarts.

Justice Thomas appears in an exhibit that was installed shortly before the one-year anniversary Sunday, a Smithsonian spokeswoman said Monday. The display honors both of the black justices who ascended to the pinnacle of the legal profession. The other is Thurgood Marshall.

Justice Thomas’ apparent omission irked conservative observers, who suspected an ideological bias among Smithsonian officials and called for the influential jurist’s inclusion in the museum.