Docker-compose: volumes:

Docker compose file: docker-compose.yml

volumes: 

See also

• docker-compose, docker-compose.yml: [services | volumes | networks | up | down | restart | logs | create | changelog | version | secrets | config | -v | -h | exec], docker-compose pull, Environment:, Docker-compose.yml examples, .env, release notes, expose:
• docker volume create

https://docs.docker.com/compose/compose-file/#volumes