diff --git a/package.json b/package.json
index 41b04e7..1b23ee2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "dev-fraxswap",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "description": "",
   "directories": {
     "lib": "lib",
diff --git a/src/contracts/core/interfaces/IFraxswapPair.sol b/src/contracts/core/interfaces/IFraxswapPair.sol
index f533590..37c4a28 100644
--- a/src/contracts/core/interfaces/IFraxswapPair.sol
+++ b/src/contracts/core/interfaces/IFraxswapPair.sol
@@ -6,6 +6,11 @@ import { IUniswapV2Pair } from "@uniswap/v2-core/contracts/interfaces/IUniswapV2
 /// @dev Fraxswap LP Pair Interface
 interface IFraxswapPair is IUniswapV2Pair {
     // TWAMM
+    struct TWAPObservation {
+        uint256 timestamp;
+        uint256 price0CumulativeLast;
+        uint256 price1CumulativeLast;
+    }
 
     event LongTermSwap0To1(address indexed addr, uint256 orderId, uint256 amount0In, uint256 numberOfTimeIntervals);
     event LongTermSwap1To0(address indexed addr, uint256 orderId, uint256 amount1In, uint256 numberOfTimeIntervals);