diff --git a/src/flight_imu.c b/src/flight_imu.c
index 7ad842884..1215077fc 100644
--- a/src/flight_imu.c
+++ b/src/flight_imu.c
@@ -1,3 +1,5 @@
+// Inertial Measurement Unit (IMU)
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <math.h>