diff --git a/README.md b/README.md
index fd53472..fb25195 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,8 @@ Usage of ./wsd:
       origin of WebSocket client (default "http://localhost/")
   -protocol string
       WebSocket subprotocol
+  -userAgent string
+      "User-Agent" header
   -url string
       WebSocket server address to connect to (default "ws://localhost:1337/ws")
   -version
diff --git a/main.go b/main.go
index 6870b88..fa33926 100644
--- a/main.go
+++ b/main.go
@@ -20,6 +20,7 @@ var (
 	origin             string
 	url                string
 	protocol           string
+	userAgent          string
 	displayHelp        bool
 	displayVersion     bool
 	insecureSkipVerify bool
@@ -35,6 +36,7 @@ func init() {
 	flag.StringVar(&origin, "origin", "http://localhost/", "origin of WebSocket client")
 	flag.StringVar(&url, "url", "ws://localhost:1337/ws", "WebSocket server address to connect to")
 	flag.StringVar(&protocol, "protocol", "", "WebSocket subprotocol")
+	flag.StringVar(&userAgent, "userAgent", "", "User-Agent header")
 	flag.BoolVar(&insecureSkipVerify, "insecureSkipVerify", false, "Skip TLS certificate verification")
 	flag.BoolVar(&displayHelp, "help", false, "Display help information about wsd")
 	flag.BoolVar(&displayVersion, "version", false, "Display version number")
@@ -92,6 +94,9 @@ func dial(url, protocol, origin string) (ws *websocket.Conn, err error) {
 	if protocol != "" {
 		config.Protocol = []string{protocol}
 	}
+	if userAgent != "" {
+		config.Header.Add("User-Agent", userAgent)
+	}
 	config.TlsConfig = &tls.Config{
 		InsecureSkipVerify: insecureSkipVerify,
 	}