diff --git a/mysql_client.lua b/mysql_client.lua
index ff07a93..dab5723 100644
--- a/mysql_client.lua
+++ b/mysql_client.lua
@@ -1,4 +1,5 @@
 
+-- MySQL client protocol in Lua.
 -- Copyright (C) Yichun Zhang (agentzh). BSD license.
 
 local tcp = require'sock'.tcp