diff --git a/.github/workflows/check-metadata.yml b/.github/workflows/check-metadata.yml
new file mode 100644
index 0000000..084a11f
--- /dev/null
+++ b/.github/workflows/check-metadata.yml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: MIT
+
+name: Metadata checker
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - main
+    paths:
+      - '*.user.js'
+      - '*.user.css'
+      - 'maintenance/check-metadata.sh'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+permissions: {}
+
+jobs:
+  check:
+    name: Check metadata
+    runs-on: ubuntu-latest
+    steps:
+    - name: Fetch source code
+      uses: actions/checkout@v4
+
+    - name: Do check metadata
+      run:
+        ./maintenance/check-metadata.sh
diff --git a/maintenance/check-metadata.sh b/maintenance/check-metadata.sh
index 48720e9..7396366 100755
--- a/maintenance/check-metadata.sh
+++ b/maintenance/check-metadata.sh
@@ -1,5 +1,11 @@
 #!/bin/bash
 
+# Check metadata of userscripts and userstyles
+#
+# Used by GitHub Actions. Can be used locally:
+#
+#	$ ./maintenance/check-metadata.sh
+
 set -e
 set -u