McLuhan: Medium is the Massage was a typo

Michael McLuhan, Marshall's son is quotes as saying:

Actually, the title was a mistake. When the book came back from the typesetter, it had on the cover "Massage" as it still does. The title should have read "The Medium is the Message" but the typesetter had made an error. When Marshall McLuhan saw the typo he exclaimed, "Leave it alone! It's great, and right on target!" Now there are four possible readings for the last word of the title, all of them accurate: "Message" and "Mess Age," "Massage" and "Mass Age.

Thanks to brushstroke.tv for sharing.