Update README.md

Author: jeffjennings

README.md

@@ -11,13 +11,13 @@ This is a basic template for a Python repository, including:
 To make a new Python repo (or codespace) using this template:
 1) Click on 'Use this template' button at the top-right of the GitHub page. 
 2) In your new repo, rename (search and replace) all instances of 'py_template' with the name for your package. 
-3) You can also update the `authors` field in `pyproject.toml` with your name(s) and email(s), and you can update `LICENSE.rst` as you like.
+3) You can also update the `authors` field in `pyproject.toml` with your name(s) and email(s), and you can update `LICENSE.rst` as you like. This template is partially based on the `OpenAstronomy packaging guide <https://github.com/OpenAstronomy/packaging-guide>`_, so please retain that aspect of the license.
 4) Update the changelog in `HISTORY.rst` when you're ready to release your first version of the code!
 
 After cloning your repo to your local machine, from the project's local root directory, you can:
 - Install your package with all optional dependencies: 
 `pip install -e ".[all]"`
-- Run your tests (from the project's root directory):
+- Run your tests:
 `pytest`
 - Build your docs:
 `tox -e build_docs`