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diff --git a/packages/contracts/src/2.0.0/forwarder/mixins/MMarketBuyZrx.sol b/packages/contracts/src/2.0.0/forwarder/mixins/MMarketBuyZrx.sol
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+++ b/packages/contracts/src/2.0.0/forwarder/mixins/MMarketBuyZrx.sol
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+/*
+
+  Copyright 2018 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity 0.4.24;
+
+import "../../protocol/Exchange/libs/LibFillResults.sol";
+import "../../protocol/Exchange/libs/LibOrder.sol";
+
+
+contract MMarketBuyZrx {
+
+    /// @dev Buys zrxBuyAmount of ZRX fee tokens, taking into account the fees on buying fee tokens. This will guarantee
+    ///      At least zrxBuyAmount of ZRX fee tokens are purchased (sometimes slightly over due to rounding issues).
+    ///      It is possible that a request to buy 200 ZRX fee tokens will require purchasing 202 ZRX tokens
+    ///      As 2 ZRX is required to purchase the 200 ZRX fee tokens. This guarantees at least 200 ZRX for future purchases.
+    /// @param orders An array of Order struct containing order specifications for fees.
+    /// @param signatures An array of Proof that order has been created by maker for the fee orders.
+    /// @param zrxBuyAmount The number of requested ZRX fee tokens.
+    /// @return totalFillResults Amounts filled and fees paid by maker and taker. makerTokenAmount is the zrx amount deducted of fees
+    function marketBuyZrxInternal(
+        LibOrder.Order[] memory orders,
+        bytes[] memory signatures,
+        uint256 zrxBuyAmount
+    )
+        internal
+        returns (LibFillResults.FillResults memory totalFillResults);
+}