This article attempts to highlight the great potential of manuscript notes for the study of Nasrid Granada in the second half of the fifteenth century. It focuses on the context of this manuscript and literary production and presents an edition and translation of a note about the great flood of 1478 in Granada included in the Arabic manuscript number 853 in the Library of the Monastery of San Lorenzo de El Escorial.
The quality and value of the information offered by this manuscript note should serve as an impetus for the study of this type of material in the future.