diff --git a/doc/usage.md b/doc/usage.md
index fb1f4a4..ac831f2 100644
--- a/doc/usage.md
+++ b/doc/usage.md
@@ -69,6 +69,8 @@ certificates:
 
 All configuration keys are optional and can be passed as arguments directly (except for `certificates` when using `acme-client auto`).
 
+Before you can issue certificates, you must create an account using `acme-client setup --agree-terms`.
+
 ## Certificate Issuance
 
 You can use `acme-client auto` to issue certificates and renew them if necessary. It uses the configuration file to