diff --git a/examples/config b/examples/config
index 9dafc939..f89af28b 100644
--- a/examples/config
+++ b/examples/config
@@ -9,5 +9,6 @@ bootstrap = "snlua bootstrap"	-- The service for bootstrap
 standalone = "0.0.0.0:2013"
 luaservice = root.."service/?.lua;"..root.."test/?.lua;"..root.."examples/?.lua"
 lualoader = "lualib/loader.lua"
+-- preload = "./examples/preload.lua"	-- run preload.lua before every lua service run
 snax = root.."examples/?.lua;"..root.."test/?.lua"
 cpath = root.."cservice/?.so"
diff --git a/examples/preload.lua b/examples/preload.lua
index 84f75d3e..f4f31034 100644
--- a/examples/preload.lua
+++ b/examples/preload.lua
@@ -1,7 +1,5 @@
 -- This file will execute before every lua service start
 -- See config
 
-local skynet = require "skynet"
-
 print("PRELOAD", ...)