diff --git a/tools/ndnsec/list.cpp b/tools/ndnsec/list.cpp
index 3b02b80..201ffbb 100644
--- a/tools/ndnsec/list.cpp
+++ b/tools/ndnsec/list.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).
  *
@@ -208,6 +208,8 @@
   po::options_description description(
     "Usage: ndnsec list [-h] [-k] [-c] [-v]\n"
     "\n"
+    "List all known identities, keys, and certificates.\n"
+    "\n"
     "Options");
   description.add_options()
     ("help,h", "produce help message")