README.md in working_hours-1.3.2 vs README.md in working_hours-1.4.0

@@ -102,9 +102,20 @@
 ``with_config`` uses keyword arguments, you can pass all or some of the supported arguments :
 - ``working_hours``
 - ``holidays``
 - ``time_zone``
 
+### Holiday hours
+Sometimes you need to configure different working hours as a one-off, e.g. the working day might end earlier on Christmas Eve.
+
+You can configure this with the `holiday_hours` option, either as an override on the existing working hours, or as a set of hours that *are* being worked on a holiday day.
+
+If *any* hours are set for a calendar day in `holiday_hours`, then the `working_hours` for that day will be ignored, and only the entries in `holiday_hours` taken into consideration.
+
+```ruby
+# Configure holiday hours
+WorkingHours::Config.holiday_hours = {Date.new(2020, 12, 24) => {'09:00' => '12:00', '13:00' => '15:00'}}
+```
 
 ## No core extensions / monkey patching
 
 Core extensions (monkey patching to add methods on Time, Date, Numbers, etc.) are handy but not appreciated by everyone. WorkingHours can also be used **without any monkey patching**: