diff --git a/.github/workflows/comment.yml b/.github/workflows/comment.yml
new file mode 100644
index 0000000000..7f9603a753
--- /dev/null
+++ b/.github/workflows/comment.yml
@@ -0,0 +1,58 @@
+name: comment
+
+on:
+  workflow_run:
+    workflows: ["build"]
+    types: [completed]
+
+jobs:
+  pr_comment:
+    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const run_id = ${{ github.event.workflow_run.id }};
+            const pull_head_sha = '${{github.event.workflow_run.head_sha}}';
+
+            const issue_number = await(async () => {
+              const pulls = await github.rest.pulls.list({ owner, repo });
+              for await (const { data } of github.paginate.iterator(pulls)) {
+                for (const pull of data) {
+                  if (pull.head.sha === pull_head_sha) {
+                    return pull.number;
+                  }
+                }
+              }
+            })();
+            if (issue_number) {
+              core.info(`Using pull request ${issue_number}`);
+            } else {
+              return core.error(`No matching pull request found`);
+            }
+
+            const { data: { artifacts } } = await github.rest.actions.listWorkflowRunArtifacts({ owner, repo, run_id });
+            if (!artifacts.length) {
+              return core.error(`No artifacts found`);
+            }
+
+            let body = `Download the artifacts for this pull request:\n\n<details><summary>Windows</summary>\n`;
+            for (const art of artifacts) {
+              const art_link = `https://nightly.link/${owner}/${repo}/actions/artifacts/${art.id}.zip`;
+              if (art.name.includes('w64')) {
+                body += `\n* [${art.name}](${art_link})`;
+              }
+            }
+            body += `\n</details>`;
+
+            const { data: comments } = await github.rest.issues.listComments({ repo, owner, issue_number });
+            const existing_comment = comments.find((c) => c.user.login === 'github-actions[bot]');
+            if (existing_comment) {
+              core.info(`Updating comment ${existing_comment.id}`);
+              await github.rest.issues.updateComment({ repo, owner, comment_id: existing_comment.id, body });
+            } else {
+              core.info(`Creating a comment`);
+              await github.rest.issues.createComment({ repo, owner, issue_number, body });
+            }