diff --git a/Tools/AP_Bootloader/board_types.txt b/Tools/AP_Bootloader/board_types.txt
index c1c702deaa..97dad40563 100644
--- a/Tools/AP_Bootloader/board_types.txt
+++ b/Tools/AP_Bootloader/board_types.txt
@@ -126,6 +126,7 @@ AP_HW_QioTekZealotH743               1036
 AP_HW_HEREPRO                        1037
 AP_HW_MAMBABASICF4                   1038
 AP_HW_ARGOSDYNE_DP1000               1039
+AP_HW_Nucleo491                      1040
 
 AP_HW_CUBEORANGE_PERIPH              1400
 AP_HW_CUBEBLACK_PERIPH               1401