How do I configure ag so that it will also search for files beginning with a "."?

I'm using ag v 2.2. How do I configure ag so that it will search for files beginning with a "." in addition to all other files? I'm noticing I have a file like so $ cat client/.env.production REACT_APP_PROXY=https://map.chicommons.coop but when I search with "ag" using a term in that file, the term doesn't come up ... $ ag 'map\.chicom' . web/directory/settings.py 28:ALLOWED_HOSTS = ['127.0.0.1', 'localhost', 'dev.chicommons.coop', 'map.chicommons.coop'] client/config.js 3: ? "map.chicommons.com"