diff --git a/engine/subtract_paid_money.asm b/engine/subtract_paid_money.asm
index a6a6ec2e..2f4c2243 100644
--- a/engine/subtract_paid_money.asm
+++ b/engine/subtract_paid_money.asm
@@ -1,5 +1,5 @@
 ; subtracts the amount the player paid from their money
-; sets carry flag if there is enough money and unsets carry flag if not
+; OUTPUT: carry = 0(success) or 1(fail because there is not enough money)
 SubtractAmountPaidFromMoney_:
 	ld de, wPlayerMoney
 	ld hl, hMoney ; total price of items
diff --git a/home.asm b/home.asm
index b8fefeb9..e0ef5539 100644
--- a/home.asm
+++ b/home.asm
@@ -1307,7 +1307,7 @@ CountSetBits::
 	ret
 
 ; subtracts the amount the player paid from their money
-; sets carry flag if there is enough money and unsets carry flag if not
+; OUTPUT: carry = 0(success) or 1(fail because there is not enough money)
 SubtractAmountPaidFromMoney::
 	jpba SubtractAmountPaidFromMoney_