diff --git a/contracts/strategies/G3MStrategyLib.sol b/contracts/strategies/G3MStrategyLib.sol
index e4f4e84c..c85d75ae 100644
--- a/contracts/strategies/G3MStrategyLib.sol
+++ b/contracts/strategies/G3MStrategyLib.sol
@@ -91,4 +91,13 @@ library G3MStrategyLib {
         deltaY = reserveY.divWadDown(reserveX).mulWadDown(reserveX + deltaX)
             - reserveY;
     }
+
+    function computeDeltaXGivenDeltaY(
+        uint256 reserveX,
+        uint256 reserveY,
+        uint256 deltaY
+    ) internal pure returns (uint256 deltaX) {
+        deltaX = reserveX.divWadDown(reserveY).mulWadDown(reserveY + deltaY)
+            - reserveX;
+    }
 }