diff --git a/README.md b/README.md
index b0d806d..2a2cc8a 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ No additional runtime dependencies are required.
 Compiled binaries for various platforms are provided in each release.
 See the [releases page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) for more information.
 
-**Usage**
+**CLI Usage**
 ```
 $ fail2ban-prometheus-exporter -h
 usage: exporter [<flags>]
@@ -56,6 +56,20 @@ Flags:
                             password to use to protect endpoints with basic auth
 ```
 
+**Environment variables**
+
+The tool can also be configured using environment variables. Each CLI parameter has a corresponding environment variable.
+
+```
+F2B_COLLECTOR_SOCKET
+F2B_COLLECTOR_TEXT
+F2B_COLLECTOR_TEXT_PATH
+F2B_WEB_PORT
+F2B_WEB_LISTEN_ADDRESS
+F2B_WEB_BASICAUTH_USER
+F2B_WEB_BASICAUTH_PASS
+```
+
 **Example**
 
 ```