Janis, Amy Berg’s eponymous documentary about Janis Joplin, is slated for world premiere at the Venice Film Festival in early September. In advance of its screening, it has now be revealed that the documentary will feature narration from Chan Marshall, the creative force behind Cat Power and a slew of other artistic endeavors.

Berg voiced her enthusiasm that Marshall is involved with the film:

After attempting to get this film off the ground for 7 years, I am ecstatic that the film is finally ready to be seen. This has been a labor of love and I cannot wait to share Janis’ unique, intimate story with the world. Chan Marshall (Cat Power) has delivered a beautiful, introspective voice of Janis by reading her letters.

The documentary seeks to “reveal the raw, sensitive, innocent, uncensored and powerful woman behind the legend” and will cover “the quintessential story of her short, turbulent and epic existence.” Berg’s new film is not to be confused with the 1974 documentary also entitled, Janis.