To amend title 4, United States Code, to permit the flag of the United States to be flown at half-staff in the event of the death of the Mayor of the District of Columbia.

This bill updates U.S. flag protocol to include the Mayor of the District of Columbia. It amends Title 4 of the U.S. Code to add the D.C. mayor to the list of officials whose death would require flying the flag at half-staff. The change specifically updates two sentences in the law, replacing references to "the Governor of a State, territory, or possession" with "the Governor of a State, territory, or possession, or the Mayor of the District of Columbia." This policy change directly affects how the U.S. flag is displayed in Washington D.C. following the death of its mayor.