diff --git a/lets-encrypt/letsencrypt.sh b/lets-encrypt/letsencrypt.sh
index 16a21b9..bc07497 100644
--- a/lets-encrypt/letsencrypt.sh
+++ b/lets-encrypt/letsencrypt.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+# Usage: /etc/nginx/certs/letsencrypt.sh /etc/nginx/certs/letsencrypt.conf
+
 CONFIG=$1
 ACME_TINY="/tmp/acme_tiny.py"