diff --git a/main.cc b/main.cc
index d99692a..88d1d5d 100644
--- a/main.cc
+++ b/main.cc
@@ -211,17 +211,17 @@ void
 usage(char *progname, bool *m) // m:a:p:h
 {
 	printf("\x1b[1mUsage:\x1b[0m\n"
-	       "\t%s client\t\x1b[3m# run as client\x1b[0m\n"
-	       "\t%s server\t\x1b[3m# run as server\x1b[0m\n"
+	       "    %s client\t\x1b[3m# run as client\x1b[0m\n"
+	       "    %s server\t\x1b[3m# run as server\x1b[0m\n"
 	       "\n\n"
 	       "\x1b[1mOptions:\x1b[0m\n"
-	       "\t\x1b[1m-m [client|server]\x1b[0m\tMode \x1b[1;31m(required)\x1b[0m\n"
+	       "    \x1b[1m-m [client|server]\x1b[0m\tMode \x1b[1;31m(required)\x1b[0m\n"
 	       "\n"
-	       "\t\x1b[1m-a [255.255.255.255]\x1b[0m\tAddress\n"
-	       "\t\t\t\tserver mode: listen address \x1b[33m(default: 0.0.0.0)\x1b[0m\n"
-	       "\t\t\t\tclient mode: address of server \x1b[33m(default: 127.0.0.1)\x1b[0m\n"
+	       "    \x1b[1m-a [255.255.255.255]\x1b[0m\tAddress\n"
+	       "    \t\t\tserver mode: listen address \x1b[33m(default: 0.0.0.0)\x1b[0m\n"
+	       "    \t\t\tclient mode: address of server \x1b[33m(default: 127.0.0.1)\x1b[0m\n"
 	       "\n"
-	       "\t\x1b[1m-p [0-65535]\x1b[0m\t\tPort number\n",
+	       "    \x1b[1m-p [0-65535]\x1b[0m\t\tPort number\n",
 	       progname, progname);
 	*m = true;
 }