modify lua

README.md

@@ -13,6 +13,14 @@ Run these in different console
 ./client 127.0.0.1 8888		# Launch a client, and try to input some words.
 ```
 
+## About Lua
+
+Skynet push a mondified version of lua 5.2.3 to 3rd/lua , it can share proto type between lua state (http://lua-users.org/lists/lua-l/2014-03/msg00489.html) .
+
+Each lua file only load once and cache it in memory during skynet start, so if you want to reflush the cache , call skynet.cache.clear() .
+
+You can also use the offical lua version , edit the makefile by yourself .
+
 ## Blog (in Chinese)
 
 * http://blog.codingnow.com/2012/09/the_design_of_skynet.html