diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..44b4e12
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,9 @@
+# Summary
+
+<!-- Brief description of the change -->
+
+## Checklist
+
+- [ ] Updated `CHANGELOG.md` under `## Unreleased` (if user-facing)
+- [ ] Tests pass locally (`pytest --cov=check_unicode`)
+- [ ] Linting passes (`ruff check src/ tests/`)
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 35cf52e..23f5647 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,6 +19,6 @@ jobs:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
       - run: pip install -e ".[dev]"
-      - run: pytest --cov=check_unicode
+      - run: pytest --cov=check_unicode --cov-fail-under=80
       - run: ruff check src/ tests/
       - run: mypy src/
diff --git a/.markdownlint-cli2.yaml b/.markdownlint-cli2.yaml
index 171d543..dec808f 100644
--- a/.markdownlint-cli2.yaml
+++ b/.markdownlint-cli2.yaml
@@ -1,3 +1,5 @@
 config:
   line-length:
     tables: false
+  no-duplicate-heading:
+    siblings_only: true