diff --git a/bricks/rtc.js b/bricks/rtc.js
index dcf93f3..41551b2 100644
--- a/bricks/rtc.js
+++ b/bricks/rtc.js
@@ -77,7 +77,7 @@ bricks.RTCClient = class extends bricks.VBox {
 		this.socket = new WebSocket(this.signaling_url);
 		this.socket.onmessage = this.signaling_message_handle.bind(this);
 		this.socket.onopen = this.signaling_login.bind(this);
-		this.socket.onclose = function(){ console.log('888888 this.socket is closed'); };
+		this.socket.onclose = function(){ console.log('888888 this.socket is closed', this.socket); };
 		this.socket.onerror = null;
 	}
 	build_head(){