A national assembly had evolved from the third estate, which was broken down. Maximum representation was from the third estate which combined all of France except the clergy and the nobility which were in the first and second estate respectively.
To manage the votes, an old rule was implemented wherein only one vote from each estate would be considered. So in spite of having a more significant number, the third estate could only represent one vote from their end.
Through this amendment, the rule could be implemented as the first, and the third estate agreed to it. The revolution was taken up by the third estate.