examples/echo_server.rb in lightio-0.3.2 vs examples/echo_server.rb in lightio-0.4.0.pre

@@ -1,6 +1,8 @@
 # Example from https://github.com/socketry/nio4r/blob/master/examples/echo_server.rb
 # rewrite it in lightio for demonstrate
+# this example demonstrate LightIO Libraries API
+# look LightIO::Library namespace to find more
 
 require 'lightio'
 
 class EchoServer
   def initialize(host, port)