diff --git a/msg/actuator_armed.msg b/msg/actuator_armed.msg
index c8098724e8..f307e366ae 100644
--- a/msg/actuator_armed.msg
+++ b/msg/actuator_armed.msg
@@ -1,6 +1,7 @@
 
 uint64 timestamp	# Microseconds since system boot
 bool armed		# Set to true if system is armed
+bool prearmed		# Set to true if the actuator safety is disabled but motors are not armed
 bool ready_to_arm	# Set to true if system is ready to be armed
 bool lockdown		# Set to true if actuators are forced to being disabled (due to emergency or HIL)
 bool force_failsafe	# Set to true if the actuators are forced to the failsafe position