The Comment, linked to the above Article on unstable housing, contributes to SDG 3 by calling for a 100-100-100 target: "stably housing 100% of PWID who are unstably housed, providing 100% of PWID access to consistent and adequate harm reduction services, and offering treatment to 100% of PWID who want substance use treatment". Such a target would be in important part of HIV and HCV elimination efforts.