diff --git a/src/Error.cs b/src/Error.cs
index 85a660f..927ffc6 100644
--- a/src/Error.cs
+++ b/src/Error.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) 2026 Viktor Stojanović. All rights reserved.
+// Licensed under the MIT License. See LICENSE.txt in the project root for license information.
+
+using System;
 
 namespace UnmanagedResult;
 
diff --git a/src/IError.cs b/src/IError.cs
index ba8f097..43feb96 100644
--- a/src/IError.cs
+++ b/src/IError.cs
@@ -1,4 +1,7 @@
-namespace UnmanagedResult;
+// Copyright (c) 2026 Viktor Stojanović. All rights reserved.
+// Licensed under the MIT License. See LICENSE.txt in the project root for license information.
+
+namespace UnmanagedResult;
 
 public interface IError
 {
diff --git a/src/IResult.cs b/src/IResult.cs
index 25b7d68..e010ec1 100644
--- a/src/IResult.cs
+++ b/src/IResult.cs
@@ -1,4 +1,7 @@
-namespace UnmanagedResult;
+// Copyright (c) 2026 Viktor Stojanović. All rights reserved.
+// Licensed under the MIT License. See LICENSE.txt in the project root for license information.
+
+namespace UnmanagedResult;
 
 public interface IResult<TValue, TError>
     where TValue : unmanaged
diff --git a/src/Result.cs b/src/Result.cs
index 0a09b62..625f973 100644
--- a/src/Result.cs
+++ b/src/Result.cs
@@ -1,4 +1,7 @@
-using System;
+// Copyright (c) 2026 Viktor Stojanović. All rights reserved.
+// Licensed under the MIT License. See LICENSE.txt in the project root for license information.
+
+using System;
 
 namespace UnmanagedResult;