diff --git a/uavcan/equipment/esc/1034.Status.uavcan b/uavcan/equipment/esc/1034.Status.uavcan
index fad4159..b15947b 100644
--- a/uavcan/equipment/esc/1034.Status.uavcan
+++ b/uavcan/equipment/esc/1034.Status.uavcan
@@ -13,4 +13,4 @@ int18 rpm                   # Negative value indicates reverse rotation
 
 uint7 power_rating_pct      # Instant demand factor in percent (percent of maximum power); range 0% to 127%.
 
-uint5 esc_index
+uint5 esc_index             # zero is first ESC. This should match the index into the cmd[] array in RawCommand