diff --git a/README.md b/README.md
index c57a93f..a0e5772 100644
--- a/README.md
+++ b/README.md
@@ -186,7 +186,7 @@ To enable them, run alvd server by passing a path to the Lua scripts.
 
     $ ./alvd server --config=examples/interceptors/sort.lua
 
-There're various types of examples of interceptors are available in [examples/interceptors](examples/interceptors) directory.
+There're various types of examples of interceptors are available in [examples/interceptors](examples/interceptors) directory and [examples/config/config.lua](examples/config/config.lua).
 
 This feature is powered by [yuin/gopher-lua](https://github.com/yuin/gopher-lua) and [vadv/gopher-lua-libs](https://github.com/vadv/gopher-lua-libs).
 
diff --git a/examples/config/config.lua b/examples/config/config.lua
index bad27c1..b7c54a1 100644
--- a/examples/config/config.lua
+++ b/examples/config/config.lua
@@ -1,3 +1,5 @@
+-- modules in gopher-lua-libs are available in Lua scripts.
+-- https://github.com/vadv/gopher-lua-libs
 local json = require("json")
 local time = require("time")