diff --git a/LICENSE b/LICENSE
index d4ae426ee..1621e7fa7 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,5 @@
+Copyright (c) 2015 Preferred Infrastructure, Inc.
+Copyright (c) 2015 Preferred Networks, Inc.
 Copyright (c) 2019 Kazuyuki Hiroshiba.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy