diff --git a/{{cookiecutter.project_name}}/pyproject.toml b/{{cookiecutter.project_name}}/pyproject.toml
index 4105e62..d3fbbc7 100644
--- a/{{cookiecutter.project_name}}/pyproject.toml
+++ b/{{cookiecutter.project_name}}/pyproject.toml
@@ -41,6 +41,9 @@ dev-dependencies = [
 requires = ["setuptools >= 61.0"]
 build-backend = "setuptools.build_meta"
 
+[tool.setuptools]
+py-modules = ["{{cookiecutter.project_slug}}"]
+
 [tool.mypy]
 files = ["{{cookiecutter.project_slug}}"]
 disallow_untyped_defs = true