diff --git a/m1rc3/usbpwr/README b/m1rc3/usbpwr/README
index 0402a75..61b393e 100644
--- a/m1rc3/usbpwr/README
+++ b/m1rc3/usbpwr/README
@@ -35,7 +35,7 @@ with current limit set to 3.0 A.
 DC input.
 
 "J21/J3" is the voltage on the internal 5 V rail measured across
-J21.1 and J3.14, with a Fluke 8845A with averaging set to 10 PLC.
+J21.1 and J3.14, with a Fluke 8845A with averaging set to 1 PLC.
 [5] shows the measurement configuration.
 
 "Boot" indicates whether the M1 can boot out of standby with the