Slow Fall (Su)
Source: Pathfinder Unchained, p. 18
A monk within arm’s reach of a wall can use it to slow his descent by expending 1 point from his ki pool. When he uses this ability, he takes no damage from the fall (as if using feather fall), but he must be adjacent to a wall for the length of the fall (although this can be used to reduce the damage from a fall if only part of it is adjacent to a wall).