diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index af62632..f797ae3 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -12,7 +12,7 @@ env:
 on:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   build:
diff --git a/README.md b/README.md
index f156445..6f85493 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![PDF-Preview](https://img.shields.io/badge/Preview-PDF-blue)](../../releases/download/auto-pdf-preview/BibVO-draft.pdf)
+
 This document describes the relation between the [Virtual
 Observatory](https://ivoa.net) and bibliographic services like the
 ADS.