diff --git a/makefiles/Makefile.python.mk b/makefiles/Makefile.python.mk
index f63ca06f5b..d66d7c8fd0 100755
--- a/makefiles/Makefile.python.mk
+++ b/makefiles/Makefile.python.mk
@@ -730,7 +730,7 @@ install_python: pypi_archive
 uninstall_python:
 	"$(PYTHON_EXECUTABLE)" -m pip uninstall ortools
 
-pypi_upload: pypi_archive
+pypi_upload: pypi_archive # Upload Wheel package to Pypi.org
 	@echo Uploading Pypi module for "$(PYTHON_EXECUTABLE)".
 	cd $(PYPI_ARCHIVE_TEMP_DIR)/ortools && twine upload dist/*