diff --git a/contracts/exchange/contracts/src/MixinProtocolFees.sol b/contracts/exchange/contracts/src/MixinProtocolFees.sol
index 8373cf8ed3..da88503c1f 100644
--- a/contracts/exchange/contracts/src/MixinProtocolFees.sol
+++ b/contracts/exchange/contracts/src/MixinProtocolFees.sol
@@ -151,7 +151,7 @@ contract MixinProtocolFees is
         internal
         returns (uint256 valuePaid)
     {
-        // Do not send a value with the call if insufficient balance
+        // Do not send a value with the call if the exchange has an insufficient balance
         // The protocolFeeCollector contract will fallback to charging WETH
         if (exchangeBalance >= protocolFee) {
             valuePaid = protocolFee;