diff --git a/avr/devices/all/sendvalue.asm b/avr/devices/all/sendvalue.asm
index d97ac38..6826419 100644
--- a/avr/devices/all/sendvalue.asm
+++ b/avr/devices/all/sendvalue.asm
@@ -24,6 +24,7 @@
 ; @param  R21:R20 denom (e.g. 100, meaning value must be divided by 100)
 ; @param  R22     value type
 ; @return CFLAG on success, cleared on error
+; @clobbers (R16, R17, R18, R19, R20, R21, R23, R24, R25, X)
 
 Main_SendValueReport:
   push r17