diff --git a/mxqkill.c b/mxqkill.c
index 8d13daed..47ec63de 100644
--- a/mxqkill.c
+++ b/mxqkill.c
@@ -34,14 +34,14 @@ static void print_usage(void)
     "\n"
     "Usage:\n"
     "  %s [options]\n"
-    "  %s [options] --group-id <group-id>\n"
+    "  %s [options] --group-id=GROUPID\n"
     "\n"
     "Synopsis:\n"
     "  kill/cancel jobs running in MXQ cluster\n"
     "\n"
     "options:\n"
     "\n"
-    "  -g | --group-id <group-id>    cancel/kill group <group-id>\n"
+    "  -g | --group-id=GROUPID   cancel/kill group <group-id>\n"
     "\n"
     "  -v | --verbose   be more verbose\n"
     "       --debug     set debug log level (default: warning log level)\n"
@@ -50,12 +50,12 @@ static void print_usage(void)
     "\n"
     "Change how to connect to the mysql server:\n"
     "\n"
-    "  -M | --mysql-default-file  [mysql-file]   (default: %s)\n"
-    "  -S | --mysql-default-group [mysql-group]  (default: %s)\n"
+    "  -M | --mysql-default-file[=MYSQLFILE]    (default: %s)\n"
+    "  -S | --mysql-default-group[=MYSQLGROUP]  (default: %s)\n"
     "\n"
     "Environment:\n"
-    "  MXQ_MYSQL_DEFAULT_FILE   change default for [mysql-file]\n"
-    "  MXQ_MYSQL_DEFAULT_GROUP  change default for [mysql-group]\n"
+    "  MXQ_MYSQL_DEFAULT_FILE   change default for MYSQLFILE\n"
+    "  MXQ_MYSQL_DEFAULT_GROUP  change default for MYSQLGROUP\n"
     "\n",
         program_invocation_short_name,
         program_invocation_short_name,