diff --git a/webmin/letsencrypt-lib.pl b/webmin/letsencrypt-lib.pl
index a2dc886fe..e6a6e0f02 100755
--- a/webmin/letsencrypt-lib.pl
+++ b/webmin/letsencrypt-lib.pl
@@ -142,7 +142,8 @@ elsif ($mode eq "dns") {
 		}
 	}
 elsif ($mode eq "certbot") {
-	# XXX what to cehck?
+	# Nothing to check here, since verification is done by the standalone
+	# certbot server
 	}
 else {
 	return (0, "Unknown mode $mode");