README.md in stock_index-0.5.0 vs README.md in stock_index-0.5.1

@@ -39,16 +39,34 @@
 
 ```ruby
 {
   :market => 'XNYS',
   :symbol => 'MMM',
-  :name => '3M CO'
+  :name => '3M CO',
+  :wikipedia => 'http://en.wikipedia.org/wiki/3M',
+  :cik => '66740',
+  :bbgid => 'BBG000BP52R2'
 }
 ```
 
+| Key       | Description |
+| ----------| ----------- |
+| market    | Market symbol according to [ISO 10383](https://github.com/javiervidal/mic) |
+| symbol    | Component symbol |
+| name      | Component name according to [Bloomberg Open Symbology](http://bsym.bloomberg.com/sym/) |
+| wikipedia | Link to the wikipedia page of the component |
+| cik       | Component CIK (Central Index Key) assigned to the company by the SEC |
+| bbgid     | BBGID (Bloomberg Security Identifier) according to [Bloomberg Open Symbology](http://bsym.bloomberg.com/sym/)|
+
+The name and cik are obtained querying the [EDGAR database](http://www.sec.gov/edgar/searchedgar/companysearch.html).
+
+The bbgid is obtained from [Bloomberg Open Symbology predefined files](http://bsym.bloomberg.com/sym/).
+
+The name, cik, and bbgid are cached using [PStore](http://ruby-doc.org/stdlib-1.9.2/libdoc/pstore/rdoc/PStore.html).
+
 ## Contributing
 
-1. Fork it ( http://github.com/<my-github-username>/stock_index/fork )
+1. Fork it ( http://github.com/javiervidal/stock_index/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create new Pull Request
 
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