Nadia Comaneci at the 1976 Montreal Olympic games
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The first Olympic gymnast to score a perfect 10

In July 1976, Romanian gymnast Nadia Comaneci won gold at the Montreal Olympics

Until the 1976 Summer Olympics no-one had ever achieved a perfect score in gymnastics.

Indeed, the scoreboard only had three digits, to display scores such as 9.50, or 9.85.

Nadia Comaneci, a 14-year-old Romanian gymnast competing at her first Olympics was to change that.

In her opening event in Montreal, her 30-second routine on the uneven bars was so perfect that the judges awarded her a 10, only to discover that there was no way to display the score on the board. To the initial confusion of the crowd, the board flashed up "1.00" instead.

Forty years on from the competition, Nadia Comaneci tells Witness about her extraordinary achievement.

Witness: The stories of our times told by the people who were there.