diff --git a/EchidnaTest.sol b/EchidnaTest.sol
index ada5bb3..00e0460 100644
--- a/EchidnaTest.sol
+++ b/EchidnaTest.sol
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-4-Clause
+pragma solidity ^0.8.1;
+
 import "ABDKMath64x64.sol";
 
 contract Test {