diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b9dbfda..6654c9d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -2,12 +2,13 @@
 
 Contributions are welcome! Please follow these guidelines when contributing.
 
-## Contribution Agreement
+## License of Contributions
 
 By contributing to this project, you agree that:
 
 - You have the legal right to provide your contribution (or you have obtained permission from the rights holder).
 - Your contribution may be used as part of this project and may be modified and redistributed as needed.
+- You retain copyright to your contribution.
 - Your contribution is provided under the terms of this project's license (see [LICENSE](/LICENSE)).
 
 ## Bug Reports / Feature Requests
diff --git a/LICENSE b/LICENSE
index 9229f9b..d03bfbb 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2025 Acompany Co., Ltd.
+Copyright (c) 2025 Acompany Co., Ltd. and The py-snp-utils Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal