diff --git a/solidity/Readme.markdown b/solidity/Readme.markdown
index 52ae831..d01ea71 100644
--- a/solidity/Readme.markdown
+++ b/solidity/Readme.markdown
@@ -181,7 +181,8 @@ Note: the contracts use `viaIR: true` (Yul IR pipeline) to avoid the EVM's
 License
 -------
 
-Copyright © 2025 Project Nayuki. (MIT License)
+Solidity port and EVM optimizations copyright © trifle-labs contributors. (MIT License)
+Based on the C implementation by Project Nayuki.
 https://www.nayuki.io/page/qr-code-generator-library
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/solidity/contracts/QRCode.sol b/solidity/contracts/QRCode.sol
index 914454f..b196146 100644
--- a/solidity/contracts/QRCode.sol
+++ b/solidity/contracts/QRCode.sol
@@ -1,7 +1,8 @@
 /*
  * QR Code generator library (Solidity)
  *
- * Copyright (c) Project Nayuki. (MIT License)
+ * Solidity port and EVM optimizations copyright (c) trifle-labs contributors.
+ * Based on the C implementation by Project Nayuki (MIT License).
  * https://www.nayuki.io/page/qr-code-generator-library
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/solidity/contracts/QRCodeDemo.sol b/solidity/contracts/QRCodeDemo.sol
index 8f79677..68ccd8c 100644
--- a/solidity/contracts/QRCodeDemo.sol
+++ b/solidity/contracts/QRCodeDemo.sol
@@ -1,7 +1,8 @@
 /*
  * QR Code generator demo (Solidity)
  *
- * Copyright (c) Project Nayuki. (MIT License)
+ * Solidity port and EVM optimizations copyright (c) trifle-labs contributors.
+ * Based on the C implementation by Project Nayuki (MIT License).
  * https://www.nayuki.io/page/qr-code-generator-library
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of