in Harry Potter and the sorcerer's stone what was in Dumbledore's letter to the Dursleys?

in the Harry potter and the sorcerer's stone when Dumbledore placed
baby Harry on his aunt Petunia Dursley's doorstep, because his parents
were murdered by Lord Voldemort. what was in Dumbledore's letter to
the Dursley Family?
i read all seven Harry potter books but it never revelved it.