README.md in rake-compiler-dock-0.3.0 vs README.md in rake-compiler-dock-0.3.1

@@ -26,45 +26,45 @@
     $ rake install
 
 
 ## Usage
 
-`rake-compiler-dock` can be used to issue commands within the docker image.
-It mounts the current working directory into the docker environment.
+Rake-compiler-dock offers the shell command `rake-compiler-dock` and a [ruby API for issuing commands within the docker image](http://www.rubydoc.info/gems/rake-compiler-dock/RakeCompilerDock).
+Both mount the current working directory into the docker environment.
 All commands are executed with the current user and group of the host.
+This is done by copying account data into the container and sudo to it.
 
 `rake-compiler-dock` without arguments starts an interactive shell session.
-You can choose between different ruby versions by `rvm use <version>` .
-All changes within the current working directory are shared with the host.
-But note, that all other changes to the file system are dropped at the end of the session - the docker image is stateless.
+All changes below the current working directory are shared with the host.
+But note, that all other changes to the file system of the contanier are dropped at the end of the session - the docker image is stateless. `rake-compiler-dock` can also take the build command(s) from STDIN or as command arguments.
 
-`rake-compiler-dock` can also take the build command(s) from STDIN or as command arguments.
-
 To build x86- and x64 Windows (Mingw) binary gems, it is typically called like this:
 
     $ cd your-gem-dir/
     $ rake-compiler-dock bash -c "bundle && rake cross native gem RUBYOPT=--disable-rubygems"
 
 The installed cross rubies can be listed like this:
 
     $ rake-compiler-dock bash -c 'rvmsudo rake-compiler update-config'
 
-The environment variable `RUBY_CC_VERSION` is predefined and includes all these versions:
+The environment variable `RUBY_CC_VERSION` is predefined and includes all these cross ruby versions:
 
     $ rake-compiler-dock bash -c 'echo $RUBY_CC_VERSION'    # =>  1.8.7:1.9.3:2.0.0:2.1.6:2.2.2
 
 Overwrite `RUBY_CC_VERSION`, if your gem does not support all available versions.
 
+You can also choose between different executable ruby versions by `rvm use <version>` . Current default is 2.2.
+
 ### Add to your Rakefile
 
 Rake-compiler-dock can be easily integrated into your Rakefile like this:
 
     task 'gem:windows' do
       require 'rake_compiler_dock'
       RakeCompilerDock.sh "bundle && rake cross native gem"
     end
 
-See [the wiki](https://github.com/larskanis/rake-compiler-dock/wiki/Projects-using-rake-compiler) for projects which use rake-compiler-dock.
+See [the wiki](https://github.com/larskanis/rake-compiler-dock/wiki/Projects-using-rake-compiler-dock) for projects which use rake-compiler-dock.
 
 ## Contributing
 
 1. Fork it ( https://github.com/larskanis/rake-compiler-dock/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)