README.md in midiops-0.3.0 vs README.md in midiops-0.3.1

- old
+ new
@@ -46,9 +46,11 @@
 
 Connect some MIDI keyboard and execute the script, then press key C5 or D5 on your midi device. Hooray!
 
 See `/examples` for more materials.
 
+Notes are like `'C3'`, `'B-1'`, `'C#4'` (sharp) or `'Db5'` (flat)
+
 ## 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).