LOS ANGELES, Feb. 24 (Xinhua) -- "Free Solo," a documentary directed by Chinese American directors, claimed Best Documentary Feature at the 91st Academy Awards ceremony, or the Oscars, held at the Dolby Theatre in Los Angeles on Sunday.

"Free Solo" is directed by Jimmy Chin and Elizabeth Chai Vasarhelyi, both of whom are of Chinese origin.

The film follows elite rock climber Alex Honnold as he attempted an unassisted ascent up the El Capitan vertical rock formation at Yosemite National Park without ropes.

"Free Solo" beat off strong competition from "Hale County This Morning, This Evening," "Minding the Gap," "Of Fathers and Sons" and "RBG."