notification
noun [ C or U ]
uk/ˌnəʊtɪfɪˈkeɪʃən/ usthe act of telling someone officially about something that has happened or will happen, or a document that does this:
a written notification
You must give the bank notification in writing if you wish to close your account.
Millions of taxpayers have now received notification of their new tax code.
notification to sb Good professional practice requires notification to clients of major changes to the composition of a firm.