diff --git a/main.go b/main.go
index 4a88f93..85680c8 100644
--- a/main.go
+++ b/main.go
@@ -17,8 +17,8 @@ type Config struct {
 var (
 	numThreads        = flag.Int("t", 1, "the numbers of threads used")
 	method            = flag.String("m", "GET", "the http request method")
-	requestBody       = flag.String("b", "", "the http requst body")
-	requestBodyFile   = flag.String("p", "", "the http requst body data file")
+	requestBody       = flag.String("b", "", "the http request body")
+	requestBodyFile   = flag.String("p", "", "the http request body data file")
 	numConnections    = flag.Int("c", 100, "the max numbers of connections used")
 	totalCalls        = flag.Int("n", 1000, "the total number of calls processed")
 	disableKeepAlives = flag.Bool("k", true, "if keep-alives are disabled")
@@ -26,12 +26,13 @@ var (
 	configFile        = flag.String("f", "", "json config file")
 	config            Config
 	target            string
-	headers           = flag.String("H", "User-Agent: go-wrk 0.1 bechmark\nContent-Type: text/html;", "the http headers sent separated by '\\n'")
+	headers           = flag.String("H", "User-Agent: go-wrk 0.1 benchmark\nContent-Type: text/html;", "the http headers sent separated by '\\n'")
 	certFile          = flag.String("cert", "someCertFile", "A PEM eoncoded certificate file.")
 	keyFile           = flag.String("key", "someKeyFile", "A PEM encoded private key file.")
 	caFile            = flag.String("CA", "someCertCAFile", "A PEM eoncoded CA's certificate file.")
 	insecure          = flag.Bool("i", false, "TLS checks are disabled")
 	respContains      = flag.String("s", "", "if specified, it counts how often the searched string s is contained in the responses")
+	readAll           = flag.Bool("r", false, "in the case of having stream or file in the response,\n it reads all response body to calculate the response size")
 )
 
 func init() {
@@ -77,6 +78,10 @@ func setRequestBody() {
 }
 
 func main() {
+	if len(os.Args) == 1 { //If no argument specified
+		flag.Usage() //Print usage
+		os.Exit(1)
+	}
 	setRequestBody()
 	switch *dist {
 	case "m":