diff --git a/contracts/exchange/contracts/src/Exchange.sol b/contracts/exchange/contracts/src/Exchange.sol
index ebf4823209..d0481f31bb 100644
--- a/contracts/exchange/contracts/src/Exchange.sol
+++ b/contracts/exchange/contracts/src/Exchange.sol
@@ -19,12 +19,15 @@
 pragma solidity ^0.5.9;
 pragma experimental ABIEncoderV2;
 
-import "./MixinWrapperFunctions.sol";
 import "./MixinMatchOrders.sol";
 import "./MixinSignatureValidator.sol";
+import "./MixinWrapperFunctions.sol";
 
 
 // solhint-disable no-empty-blocks
+// MixinAssetProxyDispatcher, MixinExchangeCore, MixinExchangeRichErrors, 
+// and MixinTransactions are all inherited via the other Mixins that are
+// used.
 contract Exchange is
     MixinSignatureValidator,
     MixinMatchOrders,