Informing the school of an absence, without giving a reason
If your child's teachers are already aware of the reason that your child will be absent – for example, because they know that a parent has a holiday from work on the same day every week – it is unnecessary to state this reason. Although it is unnecessary to state a reason for your child's absence, giving some information will help the school understand what is going on in your family's life, which will give you something to talk about with your child's teachers.