diff --git a/hardware/usb_cable_tester.sch b/hardware/usb_cable_tester.sch
index 9dda22f..5ea4965 100644
--- a/hardware/usb_cable_tester.sch
+++ b/hardware/usb_cable_tester.sch
@@ -3202,7 +3202,7 @@ device=BSS84
 T 9900 20800 5 10 0 0 180 6 1
 category=transistor
 T 10500 21300 5 10 0 1 0 0 1
-note=when VUSB is not present, the gate is pulled low to allow powering the device using the battery (bypassing the body diode). when VUSB is present, the gate is tied high, disable the transistor. the body diode prevents VUSB to mis-charge the battery.
+note=when VUSB is not present, the gate is pulled low to allow powering the device using the battery (bypassing the body diode). when VUSB is present, the gate is tied high, disable the transistor. the body diode prevents VUSB to mis-charge the battery. it also protects from reversing the polarity on the battery connector.
 }
 C 9600 21800 1 0 0 vcc-1.sym
 N 9700 21800 9900 21800 4