diff --git a/lex.go b/lex.go
index 0694e2b..aad9c00 100644
--- a/lex.go
+++ b/lex.go
@@ -1,6 +1,12 @@
+// Copyright 2013 Frank Schroeder. All rights reserved. MIT licensed.
+//
+// Parts of the lexer are taken from the template/text/parser package
+// For these parts the following applies:
+//
 // Copyright 2011 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
+// license that can be found in the LICENSE file of the go 1.2
+// distribution.
 
 package properties
 
diff --git a/parser.go b/parser.go
index c2a6e35..448239b 100644
--- a/parser.go
+++ b/parser.go
@@ -1,3 +1,5 @@
+// Copyright 2013 Frank Schroeder. All rights reserved. MIT licensed.
+
 package properties
 
 import (
diff --git a/properties.go b/properties.go
index 2b2a5ef..86e68d0 100644
--- a/properties.go
+++ b/properties.go
@@ -1,3 +1,5 @@
+// Copyright 2013 Frank Schroeder. All rights reserved. MIT licensed.
+
 package properties
 
 import (
diff --git a/properties_test.go b/properties_test.go
index dca0e42..b8e034a 100644
--- a/properties_test.go
+++ b/properties_test.go
@@ -1,3 +1,5 @@
+// Copyright 2013 Frank Schroeder. All rights reserved. MIT licensed.
+
 package properties
 
 import (