diff --git a/Source/DafnyRuntime/DafnyRuntimePython/BUILDING.md b/Source/DafnyRuntime/DafnyRuntimePython/BUILDING.md
new file mode 100644
index 0000000000..4213a37604
--- /dev/null
+++ b/Source/DafnyRuntime/DafnyRuntimePython/BUILDING.md
@@ -0,0 +1,62 @@
+# Building the DafnyRuntimePython
+
+## Prerequisites
+
+- the `dotnet` CLI, to build Dafny
+- Python, to build and upload the package
+- [TestPyPI credentials](https://packaging.python.org/en/latest/guides/using-testpypi/), if you will upload to TestPyPI
+- PyPI credentials, if you will upload to PyPI
+
+## Steps
+
+1. Ensure that the `System_` module is up-to-date:
+
+```bash
+# Ensure that the Dafny build is up-to-date,
+# as it will be used to compile the System_ module.
+$ dotnet build --project ../../Dafny
+
+# Compile the System_ runtime module.
+$ make update-system-module
+```
+
+2. Build the distribution package:
+
+```bash
+# Set up the build tooling
+$ make setup-venv
+
+# Remove old build artifacts
+$ make clean-package
+
+# Build the distribution package
+$ make build-package
+```
+
+3. Check that the distribution package looks right locally and on TestPyPI,
+   as (production) PyPI does not allow overwriting uploaded packages:
+
+```bash
+# List the distribution package's files, and check that:
+#  1. the version number is correct
+#  2. the `System_/__init__.py` file exists
+#  3. the `dafny/__init__.py` file exists
+$ tar tf dist/dafnyruntimepython-X.Y.Z.tar.gz
+
+# Upload to TestPyPI, and check that it appears correct at
+# <https://test.pypi.org/project/DafnyRuntimePython/>.
+$ make upload-package-testpypi
+```
+
+4. Upload to PyPI:
+
+```bash
+$ make upload-package-pypi
+```
+
+You can view the uploaded package at <https://pypi.org/project/DafnyRuntimePython/>.
+
+## More info
+
+The packaging process is described in
+<https://packaging.python.org/en/latest/tutorials/packaging-projects/>
diff --git a/Source/DafnyRuntime/DafnyRuntimePython/Makefile b/Source/DafnyRuntime/DafnyRuntimePython/Makefile
index caa9863277..fbb75ec8bd 100644
--- a/Source/DafnyRuntime/DafnyRuntimePython/Makefile
+++ b/Source/DafnyRuntime/DafnyRuntimePython/Makefile
@@ -23,7 +23,7 @@ setup-venv:
 	$(VIRTUALENV)/bin/pip install --upgrade build twine
 
 clean-package:
-	rm -rf dist/
+	rm -rf dist/ *.egg-info/
 
 build-package:
 	$(VIRTUALENV)/bin/python -m build