diff --git a/tools/ndnsec/set-default.cpp b/tools/ndnsec/set-default.cpp
index b0ebf09..f78d23e 100644
--- a/tools/ndnsec/set-default.cpp
+++ b/tools/ndnsec/set-default.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2023 Regents of the University of California.
+ * Copyright (c) 2013-2024 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -36,6 +36,8 @@
   po::options_description description(
     "Usage: ndnsec set-default [-h] [-k|-c] [-n] NAME\n"
     "\n"
+    "Change the default identity, key, or certificate.\n"
+    "\n"
     "Options");
   description.add_options()
     ("help,h", "produce help message")