diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
new file mode 100644
index 0000000..34336c0
--- /dev/null
+++ b/.github/workflows/lint.yaml
@@ -0,0 +1,49 @@
+name: Lint
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+jobs:
+  markdown-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v4
+        with:
+          show-progress: ''
+      - name: markdownlint-cli2-action
+        uses: DavidAnson/markdownlint-cli2-action@v9
+        with:
+          globs: |
+            **/*.md
+            #node_modules
+  textlint:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v4
+        with:
+          show-progress: ''
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - name: Install dependencies
+        run: npm install
+      - name: textlint
+        run: npm run textlint
+  vale-lint:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v4
+        with:
+          show-progress: ''
+      - name: vale
+        uses: vale-cli/vale-action@v2
+        with:
+          fail_on_error: false
diff --git a/.textlintrc.json b/.textlintrc.json
new file mode 100644
index 0000000..802decf
--- /dev/null
+++ b/.textlintrc.json
@@ -0,0 +1,5 @@
+{
+  "rules": {
+    "common-misspellings": true
+  }
+}
diff --git a/.vale.ini b/.vale.ini
new file mode 100644
index 0000000..ce34bca
--- /dev/null
+++ b/.vale.ini
@@ -0,0 +1,9 @@
+StylesPath = .github/styles
+MinAlertLevel = suggestion
+
+Packages = write-good
+
+[*.md]
+BasedOnStyles = write-good
+# E-Prime (flagging every "is"/"are"/"be") is too strict for technical docs.
+write-good.E-Prime = NO
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..bd8d2dc
--- /dev/null
+++ b/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "adr.github.io",
+  "private": true,
+  "devDependencies": {
+    "textlint": "^15.7.1",
+    "textlint-rule-common-misspellings": "^1.0.1"
+  },
+  "scripts": {
+    "textlint": "textlint -f github \"**/*.md\""
+  }
+}