diff --git a/hwdb.d/60-sensor.hwdb b/hwdb.d/60-sensor.hwdb
index c5446bd17d..e1ca6af48e 100644
--- a/hwdb.d/60-sensor.hwdb
+++ b/hwdb.d/60-sensor.hwdb
@@ -41,7 +41,9 @@
 #    PROXIMITY_NEAR_LEVEL=<value>
 #
 # where <matrix> is a mount-matrix in the format specified in the IIO
-# subsystem[1]. The default, when unset, is equivalent to:
+# subsystem[1]. The default, when unset, is the one defined by the ACPI
+# found in /sys/bus/iio/devices/iio\:deviceXXX/in_mount_matrix or, in
+# absence of it, is equivalent to:
 #   ACCEL_MOUNT_MATRIX=1, 0, 0; 0, 1, 0; 0, 0, 1
 # eg. the identity matrix,
 # and <value> is an integer value above or equal to which an object is