diff --git a/base58.go b/base58.go
index 375e850..1c8df25 100644
--- a/base58.go
+++ b/base58.go
@@ -1,6 +1,6 @@
-/*
- * Copyright (c) 2013 Conformal Systems LLC.
- */
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
 
 package btcutil
 
diff --git a/base58_test.go b/base58_test.go
index 91b0117..78e78a7 100644
--- a/base58_test.go
+++ b/base58_test.go
@@ -1,6 +1,6 @@
-/*
- * Copyright (c) 2013 Conformal Systems LLC.
- */
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
 
 package btcutil_test