diff --git a/.github/workflows/target-main.yml b/.github/workflows/target-main.yml
new file mode 100644
index 000000000..3ca6f116e
--- /dev/null
+++ b/.github/workflows/target-main.yml
@@ -0,0 +1,18 @@
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  comment:
+    if: ${{ github.base_ref }} != "master"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '⚠️ This pull request does not target the master branch.'
+            })