diff --git a/README.md b/README.md
index 1e1c00c..68926e0 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Go client library and CLI for the [Mail-in-a-Box](https://mailinabox.email/) admin DNS API.
 
+Licensed under the [MIT License](LICENSE).
+
 ## Library
 
 ```go
diff --git a/cmd/miab/main.go b/cmd/miab/main.go
index 15cfbb7..34c4dde 100644
--- a/cmd/miab/main.go
+++ b/cmd/miab/main.go
@@ -1,3 +1,7 @@
+// Copyright (c) 2026 Sławomir Koszewski. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
 package main
 
 import (
diff --git a/dns.go b/dns.go
index 98da2ac..3186475 100644
--- a/dns.go
+++ b/dns.go
@@ -1,3 +1,7 @@
+// Copyright (c) 2026 Sławomir Koszewski. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
 package miab
 
 import (
diff --git a/dns_test.go b/dns_test.go
index 282fa9d..559855e 100644
--- a/dns_test.go
+++ b/dns_test.go
@@ -1,3 +1,7 @@
+// Copyright (c) 2026 Sławomir Koszewski. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
 package miab
 
 import (