When filling out a wedding or formal-event RSVP card, you may notice a line that begins with the letter “M.” This traditional format is simply the beginning of a courtesy title, such as Mr., Mrs., Ms., or Miss. Guests traditionally complete the line by adding their preferred title followed by their name.

The custom comes from older invitation etiquette, when formal titles were commonly used to address guests. Today, many invitations use simpler wording such as “Name” or “Guest Name,” but the traditional “M” format is still sometimes used. If it appears on your RSVP card, you can provide the title you prefer or simply write your name.

When responding, the most important thing is to follow the host’s instructions and provide the requested information, including your attendance, invited guests, meal selections, or dietary needs. The “M” is not related to meals or a special question—it is simply a traditional abbreviation used to begin a courtesy title.