diff --git a/synthtool/gcp/templates/python_library/CONTRIBUTING.rst b/synthtool/gcp/templates/python_library/CONTRIBUTING.rst
index fbf574f33..e8ec21af6 100644
--- a/synthtool/gcp/templates/python_library/CONTRIBUTING.rst
+++ b/synthtool/gcp/templates/python_library/CONTRIBUTING.rst
@@ -70,9 +70,14 @@ We use `nox `__ to instrument our tests.
- To test your changes, run unit tests with ``nox``::
$ nox -s unit-2.7
- $ nox -s unit-3.7
+ $ nox -s unit-3.8
$ ...
+- Args to pytest can be passed through the nox command separated by a `--`. For
+ example, to run a single test::
+
+ $ nox -s unit-3.8 -- -k
+
.. note::
The unit tests and system tests are described in the
@@ -93,8 +98,12 @@ On Debian/Ubuntu::
************
Coding Style
************
+- We use the automatic code formatter ``black``. You can run it using
+ the nox session ``blacken``. This will eliminate many lint errors. Run via::
+
+ $ nox -s blacken
-- PEP8 compliance, with exceptions defined in the linter configuration.
+- PEP8 compliance is required, with exceptions defined in the linter configuration.
If you have ``nox`` installed, you can test that you have not introduced
any non-compliant code via::
@@ -133,13 +142,18 @@ Running System Tests
- To run system tests, you can execute::
- $ nox -s system-3.7
+ # Run all system tests
+ $ nox -s system-3.8
$ nox -s system-2.7
+ # Run a single system test
+ $ nox -s system-3.8 -- -k
+
+
.. note::
System tests are only configured to run under Python 2.7 and
- Python 3.7. For expediency, we do not run them in older versions
+ Python 3.8. For expediency, we do not run them in older versions
of Python 3.
This alone will not run the tests. You'll need to change some local