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explain error messages in README #2

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10 changes: 10 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
@@ -20,3 +20,13 @@ Put something like this in your models:
validates :count, :unit => {:allowed_types => :unitless}
validates :width, :unit => {:allowed_types => [:mass, :length]}

### Error messages

The error message upon failure can be overridden by passing the option `message` to the unit validation:

validates :quantity, :unit => {:message => 'please be so kind as to enter a physical quantity'}

If not supplied, a localised message is shown.
Translations are kept in [localeapp#6170](http://www.localeapp.com/projects/6170) - please feel free to
add a new translation or correct something.