LIBRARY.md in invoice_printer-1.3.0

- old
+ new

@@ -71,10 +71,14 @@
   items: [item],
   note: 'A note...'
 )
 ```
 
+**Note**: There is `variable` field that can be used for any
+extra column. `tax2` and `tax3` for more complex taxes are
+available as well.
+
 ### Ruby on Rails
 
 If you want to use InvoicePrinter for printing PDF documents directly from Rails
 actions, you can:
 
@@ -168,10 +172,11 @@
   swift: 'SWIFT',
   iban: 'IBAN',
   issue_date: 'Issue date',
   due_date: 'Due date',
   item: 'Item',
+  variable: '',
   quantity: 'Quantity',
   unit: 'Unit',
   price_per_item: 'Price per item',
   amount: 'Amount',
   tax: 'Tax',
@@ -179,10 +184,11 @@
   tax3: 'Tax 3',
   subtotal: 'Subtotal',
   total: 'Total'
 }
 ```
+**Note:** `variable`  fields lack default label. You should provide one.
 
 You can also use sublabels feature to provide the document in two languages:
 
 ```ruby
 labels = {
@@ -199,10 +205,11 @@
   payment_by_transfer: 'Platba na následující účet:',
   account_number: 'Číslo účtu',
   issue_date: 'Datum vydání',
   due_date: 'Datum splatnosti',
   item: 'Položka',
+  variable: '',
   quantity: 'Počet',
   unit: 'MJ',
   price_per_item: 'Cena za položku',
   amount: 'Celkem bez daně',
   subtotal: 'Cena bez daně',
@@ -213,10 +220,10 @@
 labels.merge!({ sublabels: sublabels })
 
 ...
 ```
 
-Now the document will have a little sublabels next to the original labels in Czech.
+Now the document will have little sublabels next to the original labels in Czech.
 
 ### Font
 
 To support specific characters you might need to specify a TTF font to be used:
 