diff --git a/src/IDRCoin.sol b/src/IDRCoin.sol
index 53c77a1..7c1eec8 100644
--- a/src/IDRCoin.sol
+++ b/src/IDRCoin.sol
@@ -91,6 +91,7 @@ contract IDRCoin is ERC20 {
     // external/public function
     // anyone can buy IDRC with USDT with fixed conversion rate
     function convertUSDtoIDR(uint256 amountInUSD) external {
+	// @audit: there is no check for 0 amount
         usdt.transferFrom(msg.sender, address(this), amountInUSD);
         // first we normalize the amount in usd by dividing it with its own decimals
         // then we multiply it with the conversion rate and IDRC decimals