diff --git a/setup.cfg b/setup.cfg
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--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,20 @@
+# Hello from an empty setup.cfg file!
+#
+# This project is meant to be developed using an "editable installation".  That
+# is, an installation you get from running something like `pip install -e .`.
+# With traditional distributions, from the pre-`pyproject.toml` days, this
+# would be supported through something like `setup.py develop`.
+# Later, Pip included support for `pip install -e .` in Setuptools-based
+# installations that only had a `setup.cfg` (no `setup.py`).
+#
+# PEP 660 (https://peps.python.org/pep-0660/) has standardized editable
+# installations that use only `pyproject.toml`.  Unfortunately, Setuptools does
+# not yet implement the hooks needed to support this.
+#
+# Luckily, the presence of a `setup.cfg` file is enough to trigger Pip to
+# fall back to the existing Setuptools editable-install mechanism, which is
+# still able to read project configuration from `pyproject.toml`.  And so, we
+# have this empty file.
+#
+# Once https://github.com/pypa/setuptools/issues/2816 is completed, this file
+# can probably be removed.