diff --git a/LICENSE b/LICENSE
index 8dfd252..0837e38 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,7 @@
+Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+
+Portions Copyright (c) 2022, IVM Development Group
+
 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose, without fee, and without a written agreement
 is hereby granted, provided that the above copyright notice and this