diff --git a/src/configuring-guacamole.md b/src/configuring-guacamole.md
index f36bdb9..944e966 100644
--- a/src/configuring-guacamole.md
+++ b/src/configuring-guacamole.md
@@ -1676,6 +1676,12 @@ by prompting the user directly.
   parameter is not provided, the user will be prompted for the passphrase
   upon connecting.
 
+`public-key`
+: If SSH is using certificate-based authentication, this field allows
+  you to provide the Base64-encoded CA certificate that will be used
+  to validate the certificate of the user. This parameter is optional,
+  and by default will be null.
+
 (ssh-command)=
 
 #### Running a command (instead of a shell)