diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
new file mode 100644
index 0000000..ab9fc31
--- /dev/null
+++ b/.github/workflows/style.yml
@@ -0,0 +1,16 @@
+# The mechanical house-style rules: SPDX header, no Sphinx roles in
+# docstrings, no link to the .github repo from a page, no README badges or
+# status banner. Pull requests check the changed files; a manual run checks
+# every file. Paths that aren't ours go in .style-exclude.
+name: Style
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  style:
+    uses: PyDevices/.github/.github/workflows/reusable-style-check.yml@publishing-v20
diff --git a/.style-exclude b/.style-exclude
new file mode 100644
index 0000000..f40f25d
--- /dev/null
+++ b/.style-exclude
@@ -0,0 +1,5 @@
+# Paths the style check skips: code that isn't ours, and generated files.
+# One glob per line.
+
+# MicroPython's own mip installer, kept as upstream wrote it.
+lib-overrides/mip/
diff --git a/modules/displayif/tools/test_usdl2.py b/modules/displayif/tools/test_usdl2.py
index d99d009..8a5ae70 100644
--- a/modules/displayif/tools/test_usdl2.py
+++ b/modules/displayif/tools/test_usdl2.py
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Brad Barnett
+#
 # SPDX-License-Identifier: MIT
 """Smoke test for usdl2 (MicroPython unix/windows or CircuitPython unix)."""
 
diff --git a/modules/picotts/py/picotts.py b/modules/picotts/py/picotts.py
index 9b26a88..7ec7abb 100644
--- a/modules/picotts/py/picotts.py
+++ b/modules/picotts/py/picotts.py
@@ -1,5 +1,6 @@
 # SPDX-FileCopyrightText: 2026 Adafruit Industries
 # SPDX-FileCopyrightText: 2026 PyDevices
+#
 # SPDX-License-Identifier: MIT
 """Text to speech on the SVOX Pico engine by SVOX AG (Apache-2.0).