diff --git a/simple-tcp-proxy.go b/simple-tcp-proxy.go
index 032ec3b..66bcfc9 100644
--- a/simple-tcp-proxy.go
+++ b/simple-tcp-proxy.go
@@ -47,7 +47,7 @@ func main() {
 		return
 	}
 	if len(tcpListenConfig.TcpListens) == 0 {
-		fmt.Println("[ERROR] Not find any mapping in config")
+		fmt.Printf("[ERROR] Not find any mapping in config\n")
 		printHelpMessage()
 		return
 	}
@@ -62,7 +62,7 @@ func main() {
 func serverTcpListen(tcpListen TcpListen) {
 	lis, err := net.Listen("tcp", tcpListen.Listen)
 	if err != nil {
-		fmt.Println(err)
+		fmt.Printf("[ERROR] Listen on port %s error: %s\n", tcpListen.Listen, err)
 		return
 	}
 	defer lis.Close()