The invention relates to a method for updating a content of a given warning message emitted in an aircraft by a monitoring system (100, 200) in case of detection of a particular state of at least one monitored system (400) of the said aircraft, characterized in that the said method comprises a step of delivery (1) of a plurality of modification information items to a selection tool, each modification information item defining a modification of a content of a warning message capable of being emitted by the said monitoring system, the selection tool being capable of selecting at least one information item among the said plurality of modification information items in such a way as to permit modification of the said content of the said given warning message.