diff --git a/COPYING.md b/COPYING.md
index c2f0db1a6a..5acda3f9c2 100644
--- a/COPYING.md
+++ b/COPYING.md
@@ -54,6 +54,7 @@ public/piece/merida | Armando Hernandez Marroquin | [GPLv2+](https://www.gnu.org
 public/piece/shapes | [flugsio](https://github.com/flugsio/chess_shapes) | [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)
 public/piece/pixel | [therealqtpi](https://twitter.com/therealqtpi) | AGPLv3+
 public/piece/california | [Jerry S.](https://sites.google.com/view/jerrychess/home) | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)
+public/piece/maestro | [sadsnake1](https://github.com/sadsnake1) | [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)
 public/sounds/futuristic | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+
 public/sounds/nes | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+
 public/sounds/piano | [Enigmahack](https://github.com/Enigmahack) | AGPLv3+