diff --git a/yubikey-ca-java/README.md b/yubikey-ca-java/README.md
index 3457a8e..8d23443 100644
--- a/yubikey-ca-java/README.md
+++ b/yubikey-ca-java/README.md
@@ -49,6 +49,7 @@ $ java -jar yubikey-ca-java.jar --issue-server-ca \
        --intermediate-ca-id 44 --keypair-type secp256r1 \
        --dns-name a.example.com --dns-name b.example.com \
        --pin ****** \
+       [--cert-slot NN | --cert-file <CERT-FILE-PEM>] \
        [--add-to-remote]
 ```