I just finished enveloping my cute vintage-postcard save-the-dates, which I used with a make-you-own-custom stamp, saying "Save the Date," and the date, our names and town where the wedding will be held.
Problem is I just realized that I did not include the wording "Formal Invitation to Follow," at the bottom of the stamped message. Is this important enough that I should open all of my sealed (but not post-marked) envelopes and add that line?
Save the Dates are so common now, that I think everyone realizes that they are a pre-cursor to the actual wedding invitation...but I don't want to start the event off with a huge breach of etiquette... help!