diff --git a/mailserver.env b/mailserver.env
index 6dcc0bd6..e2afd0a6 100644
--- a/mailserver.env
+++ b/mailserver.env
@@ -42,6 +42,7 @@ DMS_VMAIL_GID=
 
 # **empty** => use FILE
 # LDAP => use LDAP authentication
+# OIDC => use OIDC authentication (not yet implemented)
 # FILE => use local files (this is used as the default)
 ACCOUNT_PROVISIONER=