diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
new file mode 100644
index 0000000..762a220
--- /dev/null
+++ b/CONTRIBUTORS.rst
@@ -0,0 +1,7 @@
+nested-lookup is public domain and open source.
+
+To contribute please make sure all tests pass.
+
+If you are adding new functionality please write a test for the functionality.
+
+To avoid discussions regarding code formatting, please use `black <https://github.com/ambv/black>` with default settings.