README.md in train-tax-calculator-1.0.1 vs README.md in train-tax-calculator-1.1.0

@@ -14,35 +14,63 @@
 
 Or install it yourself as:
 
     $ gem install train-tax-calculator
 
+## References
+
+SSS [https://philpad.com/new-sss-contribution-table/](https://philpad.com/new-sss-contribution-table/)  
+Philhealth [https://www.philhealth.gov.ph/circulars/2017/circ2017-0024.pdf](https://www.philhealth.gov.ph/circulars/2017/circ2017-0024.pdf)  
+Pagibig [https://philpad.com/pagibig-contribution-table/](https://philpad.com/pagibig-contribution-table/)  
+
 ## Usage
 
+If using IRB, require the library first.
+
+```ruby
+require 'train/tax/calculator'
+```
+
+Get Withholding Tax
+```ruby
+Train::Tax::Calculator.withholding_tax(15_000)
+```
+
+Get Net Income
+```ruby
+Train::Tax::Calculator.net_income(15_000)
+```
+
 Get SSS contribution
 ```ruby
-Train::Tax::Calculator.for_sss(15_000) # base salary
+sss = Train::Tax::Calculator.for_sss(15_000) # where 15_000 is the basic salary
+
+# employee share
+sss[:es]
+
+# employer share
+sss[:er]
 ```
 
 Get Pagibig contribution
 ```ruby
-Train::Tax::Calculator.for_pagibig(15_000) # base salary
+Train::Tax::Calculator.for_pagibig(15_000) # where 15_000 is the basic salary
 ```
 
 Get Philhealth contribution
 ```ruby
-Train::Tax::Calculator.for_philhealth(15_000) # base salary
+Train::Tax::Calculator.for_philhealth(15_000) # where 15_000 is the basic salary
 ```
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
 
 To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/train-tax-calculator. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
+Bug reports and pull requests are welcome on GitHub at https://github.com/mrkjlchvz/train-tax-calculator. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
 
 ## Code of Conduct
 
 Everyone interacting in the Train::Tax::Calculator project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/[USERNAME]/train-tax-calculator/blob/master/CODE_OF_CONDUCT.md).