diff --git a/actionpack/lib/action_view/helpers/number_helper.rb b/actionpack/lib/action_view/helpers/number_helper.rb
index 42e2100099..a9400c347f 100644
--- a/actionpack/lib/action_view/helpers/number_helper.rb
+++ b/actionpack/lib/action_view/helpers/number_helper.rb
@@ -86,11 +86,13 @@ module ActionView
# * :unit - Sets the denomination of the currency (defaults to "$").
# * :separator - Sets the separator between the units (defaults to ".").
# * :delimiter - Sets the thousands delimiter (defaults to ",").
- # * :format - Sets the format of the output string (defaults to "%u%n").
- # * :negative_format - Sets the format of the output string (defaults to "-" + :format). The field types are:
- #
- # %u The currency unit
- # %n The number
+ # * :format - Sets the format for non-negative numbers (defaults to "%u%n").
+ # Fields are %u for the currency, and %n
+ # for the number.
+ # * :negative_format - Sets the format for negative numbers (defaults to prepending
+ # an hyphen to the formatted number given by :format).
+ # Accepts the same fields than :format, except
+ # %n is here the absolute value of the number.
#
# ==== Examples
# number_to_currency(1234567890.50) # => $1,234,567,890.50