diff --git a/orx-gui/README.md b/orx-gui/README.md
index 83d7249a..886a8848 100644
--- a/orx-gui/README.md
+++ b/orx-gui/README.md
@@ -117,3 +117,7 @@ import org.openrndr.extra.parameters.DoubleParameter
     }
 }
 ```
+
+## Credits
+
+`orx-gui` is based on a proof-of-concept by [Ricardo Matias](https://github.com/ricardomatias/)
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