Added :locale option explanation for number_to_currency

actionpack/lib/action_view/helpers/number_helper.rb

@@ -82,6 +82,7 @@ def number_to_phone(number, options = {})
       # in the +options+ hash.
       #
       # ==== Options
+      # * <tt>:locale</tt>     -  Sets the locale to be used for formatting (defaults to current locale).
       # * <tt>:precision</tt>  -  Sets the level of precision (defaults to 2).
       # * <tt>:unit</tt>       - Sets the denomination of the currency (defaults to "$").
       # * <tt>:separator</tt>  - Sets the separator between the units (defaults to ".").
@@ -95,6 +96,7 @@ def number_to_phone(number, options = {})
       #  number_to_currency(1234567890.50)                    # => $1,234,567,890.50
       #  number_to_currency(1234567890.506)                   # => $1,234,567,890.51
       #  number_to_currency(1234567890.506, :precision => 3)  # => $1,234,567,890.506
+      #  number_to_currency(1234567890.506, :locale => :fr)   # => 1,234,567,890.506 €
       #
       #  number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "")
       #  # => &pound;1234567890,50