diff --git a/README.md b/README.md
index 2f5ac9e..f32a66f 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,14 @@ justcaptcha ver. 1.0
 
 A simple CAPTCHA service implementation.
 
+## Usage
+
+    justcaptchad -expiry 5m -listen /var/run/justcaptchad/j.sock
+
+`-expiry` takes time for CAPTCHA to be valid for in format XX{s,m,h}.
+
+`-listen` is `ip:port` or `/path/to/unix.sock` to listen on.
+
 ## API
 
 ### Get a new captcha