diff --git a/core/ws/ws.go b/core/ws/ws.go
index 94ef369..5754de2 100644
--- a/core/ws/ws.go
+++ b/core/ws/ws.go
@@ -67,7 +67,7 @@ func Handler(w rest.ResponseWriter, r *rest.Request) {
 			continue
 		}
 
-		log.Printf("recv: %s", message)
+		log.Printf("recv: %+v", message)
 
 		// check version
 		err = checkVersion(message.Version)