diff --git a/README.md b/README.md
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+# auspost-drc #
+
+A rubygem for accessing the Australia Post Delivery Rate Calculator.
+
+Please note that in order to use this service, you must agree to the [Australia Post DRC terms and conditions](http://www.edeliver.com.au/Templates/ifs/IFS_DRC_Terms.htm) - I take no responsibility for
+how you use this library, it is simply a wrapper around the DRC api.
+
+## Usage ##
+
+    require 'aus_post/drc'
+    
+    result = AusPost::DRC.calculate(:length => 100, :height => 100, :width => 100,
+      :destination => 'XXXX', :pickup => 'YYYY', :country => 'AU', :service_type => :express,
+      :weight => 1, :quantity => 1)
+      
+The following are optional with the following defaults:
+
+* `:quantity` - defaults to `1`
+* `:service_type` - defaults to `:standard`
+* `:country` - defaults to `'AU'`. As a 2 character country code
+
+The calculator has the following methods:
+
+- `result.charge` - charge as a float, nil on error
+- `result.days` - days as integer, nil on error
+- `result.charge_as_string` - charge as string, nil on error
+
+With exception-throwing variants:
+
+- `result.charge!` - charge as a float, throwing an error otherwise.
+- `result.days!` - days as integer, throwing an error otherwise.
+- `result.charge_as_string!` - charge as string, throwing an error otherwise.
+
+## Note on Patches/Pull Requests ##
+ 
+1. Fork the project.
+2. Make your feature addition or bug fix.
+3. Add tests for it. This is important so I don't break it in a future version unintentionally.
+4. Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
+5. Send me a pull request. Bonus points for topic branches.
+
+## Copyright ##
+
+Copyright (c) 2010 Darcy Laycock. See LICENSE for details.
+
+Australia Post and other assorted trademarks are copyright Australia Post.
+  
+
+
diff --git a/lib/aus_post/drc/service_type.rb b/lib/aus_post/drc/service_type.rb
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+++ b/lib/aus_post/drc/service_type.rb
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+module AusPost
+  module DRC
+    class ServiceType
+      
+      def self.mapping
+        @mapping ||= []
+      end
+      
+      def self.add_mapping(short_name, code, description)
+        mapping << ServiceType.new(short_name, code, description)
+      end
+      
+      def self.[](code)
+        item = mapping.detect { |st| st.matches?(code) }
+        item && item.code
+      end
+      
+      def self.for_select
+        mapping.map { |st| [st.description, st.short_name.to_s] }
+      end
+      
+      attr_accessor :code, :short_name, :description
+      
+      def initialize(short_name, code, description)
+        @short_name  = short_name.to_s
+        @code        = code.to_s
+        @description = description.to_s
+      end
+      
+      def to_s
+        @code
+      end
+      
+      def matches?(text)
+        text = text.to_s.strip
+        !text.empty? && [short_name, code, description].any? { |v| v == text }
+      end
+      
+      add_mapping :standard,                                  'Standard', 'Regular'
+      add_mapping :express,                                   'Express',  'Express'
+      add_mapping :express_platinum,                          'Exp_Plt',  'Express Platinum'
+      add_mapping :express_courier_international_document,    'ECI_D',    'Express Courier International Document'
+      add_mapping :express_courier_international_merchandise, 'ECI_M',    'Express Courier International Merchandise'
+      add_mapping :international_air,                         'Air',      'International Air'
+      add_mapping :international_sea,                         'Sea',      'International Sea'
+      
+    end
+  end
+end
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