diff --git a/O21.Game/Engine/Environments.fs b/O21.Game/Engine/Environments.fs
index aa5a3c1..1d29c14 100644
--- a/O21.Game/Engine/Environments.fs
+++ b/O21.Game/Engine/Environments.fs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2024 O21 contributors <https://github.com/ForNeVeR/O21>
+//
+// SPDX-License-Identifier: MIT
 module O21.Game.Engine.Environments
 
 open O21.Game.U95
diff --git a/O21.Tests/Helpers.fs b/O21.Tests/Helpers.fs
index ecbbffa..791759b 100644
--- a/O21.Tests/Helpers.fs
+++ b/O21.Tests/Helpers.fs
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: 2024 O21 contributors <https://github.com/ForNeVeR/O21>
+//
+// SPDX-License-Identifier: MIT
 module O21.Tests.Helpers
 
 open O21.Game.U95