1. Member States shall take the necessary measures to ensure that each worker has the right to carers' leave of five working days per year. Member States may determine additional details regarding the scope and conditions of carers' leave in accordance with national law or practice. The use of that right may be subject to appropriate substantiation, in accordance with national law or practice.

2. Member States may allocate carers' leave on the basis of a reference period other than a year, per person in need of care or support, or per case.