diff --git a/base64/base64.v b/base64/base64.v
index 8be132268c..94d11eac23 100644
--- a/base64/base64.v
+++ b/base64/base64.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module base64
 
 const (
diff --git a/base64/base64_test.v b/base64/base64_test.v
index 720c47f651..6137907851 100644
--- a/base64/base64_test.v
+++ b/base64/base64_test.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 import base64
 
 fn test_decode() {
diff --git a/math/math.v b/math/math.v
index 9d0725d9b2..b216ecd481 100644
--- a/math/math.v
+++ b/math/math.v
@@ -1,3 +1,7 @@
+// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+
 module math
 
 #include <math.h>