@@ -126,12 +126,14 @@ Multiple upstreams can either be configured by supplying a comma separated list
126126
127127Every command line argument can be specified as an environment variable by
128128prefixing it with `OAUTH2_PROXY_`, capitalising it, and replacing hypens (`-`)
129−with underscores (`_`). This is particularly useful for storing secrets outside
130−of a configuration file or the command line.
129+with underscores (`_`). If the argument can be specified multiple times, the
130+environment variable should be plural (trailing `S`).
131131
132−For example, the `--cookie-secret` flag becomes `OAUTH2_PROXY_COOKIE_SECRET` and
133−the `--set-authorization-header` flag becomes `OAUTH2_PROXY_SET_AUTHORIZATION_HEADER`.
132+This is particularly useful for storing secrets outside of a configuration file
133+or the command line.
134134
135+For example, the `--cookie-secret` flag becomes `OAUTH2_PROXY_COOKIE_SECRET`,
136+and the `--email-domain` flag becomes `OAUTH2_PROXY_EMAIL_DOMAINS`.
135137
136138## Logging Configuration
137139