wordpress compose file v2 with docker volume

docker-compose.yml

version: '2'

services:
  db:
    image: mysql
    environment:
      - MYSQL_ROOT_PASSWORD=mypass
    volumes:
      - db-data:/var/log/mysql
  wp:
    image: wordpress
    environment:
      - WORDPRESS_DB_HOST=db
      - WORDPRESS_DB_PASSWORD=mypass
    volumes:
      - wp-data:/var/www/html
    ports:
      - 80:80
volumes:
   db-data:
      driver: local
   wp-data:
      driver: local

Hi
I would like to mount a folder from /mnt/wp-content to wp-content and /mnt/db-data instead of a volume how can I do that thank you