diff --git a/skynet-src/socket_server.h b/skynet-src/socket_server.h
index 41ef9cca..96e38980 100644
--- a/skynet-src/socket_server.h
+++ b/skynet-src/socket_server.h
@@ -16,7 +16,7 @@ struct socket_server;
 struct socket_message {
 	int id;
 	uintptr_t opaque;
-	int ud;	// for accept, ud is listen id ; for data, ud is size of data 
+	int ud;	// for accept, ud is new connection id ; for data, ud is size of data 
 	char * data;
 };