README.md in o-2.0.1 vs README.md in o-2.0.2

@@ -5,10 +5,12 @@
 **Author**:	Guten <br/>
 **License**: MIT-LICENSE <br/>
 **Documentation**: [http://rubydoc.info/gems/o/frames](http://rubydoc.info/gems/o/frames) <br/>
 **Issue Tracker**: [https://github.com/GutenYe/o/issues](https://github.com/GutenYe/o/issues) <br/>
 
+then name `o` comes from option/setting, short and handy, eh-ah~
+
 Features
 --------
 
 * support variable, computed attribute
 * DSL syntax in pure ruby
@@ -20,15 +22,15 @@
 
 do configuration at three levels: system, user, cmdline
 
 	lib/guten/rc.rb   # system level
 	~/.gutenrc        # user level
-	$ guten --list    # cmdline level
+	$ guten --list or ENV[GEMFILE]=x guten  # cmdline level
 		
 	module Guten
 		Rc = O.require("guten/rc") + O.require("~/.gutenrc")
-		Rc.list = true
+		Rc.list = true or Rc.gemfile = ENV[GEMFILE] # from cmdline.
 	end
 
 
 ### a completed example ###
 
@@ -60,11 +62,11 @@
 		end
 
 		c.time = proc{|offset| Time.now}
 	end
 
-a sugar syntax 
+a sugar syntax. _works in a file only_ 
 
 	# file: guten/rc.rb
 	development:
 		adapter "mysql2"
 		database "hello"
@@ -76,13 +78,14 @@
 		adapter "mysql2"
 		database "hello"
 		username "guten"
 	end
 
+this is not pure ruby syntax, but it works.
+
 **WARNNING**:  must use \t to indent for this sugar syntax.
 
-
 ### initialize ###
 
 either way is fine
 
 	Rc = O.new
@@ -134,12 +137,12 @@
 		my do
 			age 2
 			friend do
 				age 3
 				p age     #=> 3
-				p __.age  #=> 2  relative
-				p ___.age #=> 1
-				p _.age   #=> 1  root
+				p __.age  #=> 2  __ is relative up to 1 times
+				p ___.age #=> 1  ___ and so on is relative up to 2 and so on times
+				p _.age   #=> 1  _ is root
 			end
 		end
 	end
 
 ### namespace ###