ovs-openflowd: Improve usage message.

diff --git a/utilities/ovs-openflowd.c b/utilities/ovs-openflowd.c
index 818ed79bbb4fb7d9cd23d1543e5bae0511fc7959..5ed32683929bdb443b9fce76be02759855a5f044 100644 (file)
--- a/utilities/ovs-openflowd.c
+++ b/utilities/ovs-openflowd.c
@@ -493,8 +493,9 @@ static void
 usage(void)
 {
     printf("%s: an OpenFlow switch implementation.\n"
-           "usage: %s [OPTIONS] DATAPATH [CONTROLLER...]\n"
-           "DATAPATH is a local datapath (e.g. \"dp0\").\n"
+           "usage: %s [OPTIONS] [TYPE@]DATAPATH [CONTROLLER...]\n"
+           "where DATAPATH is a local datapath (e.g. \"dp0\")\n"
+           "optionally with an explicit TYPE (default: \"system\").\n"
            "Each CONTROLLER is an active OpenFlow connection method.  If\n"
            "none is given, ovs-openflowd performs controller discovery.\n",
            program_name, program_name);