diff --git a/MANIFEST.in b/MANIFEST.in
index f2f65de..9d34822 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,4 @@
-include LICENSE.txt README.rst notes.org tiny-client-demo.py h11/py.typed
+include LICENSE.txt README.rst notes.org tiny-client-demo.py tox.ini h11/py.typed
 recursive-include docs *
 recursive-include h11/tests *
 recursive-include fuzz *
diff --git a/newsfragments/164.bugfix.rst b/newsfragments/164.bugfix.rst
new file mode 100644
index 0000000..77d1912
--- /dev/null
+++ b/newsfragments/164.bugfix.rst
@@ -0,0 +1,2 @@
+Include ``tox.ini`` in source distributions so downstream packagers can run
+the bundled test configuration from the sdist.