In the sixth aliyah, Noach plants a vineyard and makes wine from the grapes. He drinks from the wine, and becomes drunk. He falls asleep naked, and according to Rashi, Noach's son Cham castrates Noach because he didn't want him to have a fourth son.
Noach's other two sons, Shaim and Yefes, modestly approach Noach and cover him. When Noach awakens, he realizes what happened, and curses Cham's grandson, Canaan, and blesses Shaim and Yefes. This aliyah then documents the descendants of Noach's three sons after the flood.