README.md in excel-esv-0.0.3 vs README.md in excel-esv-0.0.4

@@ -9,52 +9,58 @@
 
 ## Usage
 
 ### Generate
 
-```
+``` ruby
+require "esv"
+
 data = ESV.generate do |esv|
   esv << [ "Name", "Dogs", "Cats" ]
   esv << [ "Victor", 1, 4 ]
 end
 
 File.write("/tmp/test.xls", data)
 ```
 
 ### Parse
 
-```
-excel = File.read("/tmp/test.xls")
+``` ruby
+require "esv"
+
+data = File.read("/tmp/test.xls")
 output = ESV.parse(data)  # => [ [ "Name", "Dogs", … ], … ]
 ```
 
+This assumes a file with a single worksheet and will raise otherwise.
+
 ### Generate in Ruby on Rails
 
 In `config/initializers/mime_types.rb`:
 
-```
+``` ruby
 Mime::Type.register ESV::MIME_TYPE, "xls"
 ```
 
 As a model or whatever you prefer:
 
-```
+``` ruby
 class MyExcelDocument
-  def generate(name)
+  def self.generate(name)
     ESV.generate { |esv| esv << [ "Hello #{name}" ] }
   end
 end
 ```
 
 Controller:
 
-```
+``` ruby
 class MyController < ApplicationController
   include ESV::RailsController  # for send_excel
 
   def show
-    data = MyExcelDocument.new("Rails").generate
+    data = MyExcelDocument.generate("Rails")
     send_excel(data)
   end
 
   def another_example
     respond_to do |format|
@@ -68,10 +74,10 @@
 
 ## Installation
 
 Add this line to your application's Gemfile:
 
-```ruby
+``` ruby
 gem 'excel-esv'
 ```
 
 And then execute: