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Thanks to an Australian computer programmer... Neil Armstrong will not go down in history as having marred man's first words on the moon with a tautology about man's first step on the moon. The missing "a" was found and the famous quote was proved to be "One small step for a man...":

"The question of whether Armstrong fluffed the first lines from the surface of the moon has dogged him for the past 37 years. Sticklers for grammar point out that 'One small step for man, one giant leap for mankind' was tautology on a grand scale."

tautology (t-tol'?-je)
n., pl. -gies.
                Needless repetition of the same sense in different words; redundancy.

                   An instance of such repetition.

                   Logic. An empty or vacuous statement composed of simpler statements in a fashion that makes it logically true whether the simpler statements are factually true or false; for example, the statement Either it will rain tomorrow or it will no rain tomorrow.

[Late Latin tautologia, from Greek tautologia, from tautologos, redundant : tauto-, tauto- logos, saying; see logy.]