Minor help string clarification for client-ID

Document that the value of -c must be a 16-bit type (network byte order) followed by a client-ID value.
For example, to use a UUID based client-ID (type 4, RFC 6355) one could use the following cmdline option:
  -c0004<128_bit_uuid_in_hex>

diff --git a/src/odhcp6c.c b/src/odhcp6c.c
index a37de913a7c722a2ed11e110428a0d93d5c57374..8b5cb54308c8f7224e37c3dbd7d5e1571981d53e 100644 (file)
--- a/src/odhcp6c.c
+++ b/src/odhcp6c.c
@@ -429,7 +429,7 @@ static int usage(void)
        "       -F              Force IPv6-Prefix\n"
        "       -V <class>      Set vendor-class option (base-16 encoded)\n"
        "       -u <user-class> Set user-class option string\n"
        "       -F              Force IPv6-Prefix\n"
        "       -V <class>      Set vendor-class option (base-16 encoded)\n"
        "       -u <user-class> Set user-class option string\n"

-       "       -c <clientid>   Override client-ID (base-16 encoded)\n"
+       "       -c <clientid>   Override client-ID (base-16 encoded 16-bit type + value)\n"

        "       -i <iface-id>   Use a custom interface identifier for RA handling\n"
        "       -r <options>    Options to be requested (comma-separated)\n"
        "       -R              Do not request any options except those specified with -r\n"
        "       -i <iface-id>   Use a custom interface identifier for RA handling\n"
        "       -r <options>    Options to be requested (comma-separated)\n"
        "       -R              Do not request any options except those specified with -r\n"