diff --git a/selfdrive/locationd/locationd.py b/selfdrive/locationd/locationd.py
index 369b68b887..c222e20e6e 100755
--- a/selfdrive/locationd/locationd.py
+++ b/selfdrive/locationd/locationd.py
@@ -244,7 +244,7 @@ class Localizer():
       # Accelerometer
       if sensor_reading.sensor == 1 and sensor_reading.type == 1:
         # check if device fell, estimate 10 for g
-        # 40g is a good filter for falling detection, no false positives in 20k minutes of driving
+        # 40m/s**2 is a good filter for falling detection, no false positives in 20k minutes of driving
         self.device_fell = abs(sensor_reading.acceleration.v[0] - 10) > 40
 
         self.acc_counter += 1