diff --git a/nshlib/nsh_command.c b/nshlib/nsh_command.c
index cca237151..4f51ca813 100644
--- a/nshlib/nsh_command.c
+++ b/nshlib/nsh_command.c
@@ -474,7 +474,7 @@ static const struct cmdmap_s g_cmdmap[] =
 
 #if defined(CONFIG_NSH_TELNET) && !defined(CONFIG_NSH_DISABLE_TELNETD)
 #if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
-  {"telnetd",   cmd_telnetd,  2, 2, [ipv4|ipv6] },
+  {"telnetd",   cmd_telnetd,  2, 2, "[ipv4|ipv6]" },
 #else
   {"telnetd",   cmd_telnetd,  1, 1, NULL },
 #endif