Did Neil Armstrong mislead the world about his 'one small step' line?

It's one of the most famous lines in human history: "That's one small step for [a] man, one giant leap for mankind." Whether Neil Armstrong — who died in August at age 82 — actually included the "a" has been the subject of debate for decades (he claims it was lost in transmission). And now, thanks to a new BBC documentary, Neil Armstrong — First Man on the Moon, we might finally have our answer.

Brother Dean Armstrong says in the doc that the line wasn't thought up on the spot like the Apollo 11 mission commander long suggested. Instead, the astronaut allegedly wrote the phrase down weeks before the mission, slipping it to his brother on a piece of paper as they played a game of Risk. "Before he went to Cape, he invited me down to spend a little time with him," said Dean. "[Neil] said, 'Why don't you and I, once the boys go to bed, why don't we play a game of Risk.'"

Here's what Dean says happened next, according to the Telegraph:

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Armstrong always claimed he thought up the line after touching down on the moon, but "he gave it a bit more thought than that," Dr. Christopher Riley, the documentary's director, tells the Telegraph. "I think the reason he always claimed he'd thought it up after landing was that he was bombarded by suggestions in the run up to the mission, and found them a distraction to the business of landing on the moon." In the end, "it was probably easier to just say that he'd thought it up after landing, thus dodging the issue of where the words came from." Well, that makes sense, says Dina Spector at Business Insider. Armstrong "was known for his modesty and camera-shy persona. He avoided the press and relished his privacy, despite being hailed as a hero."