README.md in datapipes-0.1.3 vs README.md in datapipes-0.1.4

@@ -44,10 +44,11 @@
 
  Composed Sink works concurrently.
 ```
 
 ## Installation
+__datapipes requires Ruby >= 2.0.__
 
 Add this line to your application's Gemfile:
 
     gem 'datapipes'
 
@@ -61,10 +62,10 @@
 
 ## Usage
 You have to define your own Source, Tube and Sink. See more in `examples`.
 
 ### Composing objects
-TODO...
+See more in `examples/composing.rb`.
 
 ## Contributing
 
 1. Fork it ( http://github.com/taiki45/datapipes/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)