diff --git a/.github/workflows/auto-add-contributors.yml b/.github/workflows/auto-add-contributors.yml
index 0a947748..706d0693 100644
--- a/.github/workflows/auto-add-contributors.yml
+++ b/.github/workflows/auto-add-contributors.yml
@@ -1,12 +1,17 @@
 name: Automatically Add Contributors
-run-name: ${{ github.actor }} is updating TinyML book contributors
 on:
   push:
     branches:
-      main
+      - main
+  pull_request:
+    branches:
+      - main
+    types:
+      - closed
 
 jobs:
   update-contributors:
+    if: (github.event_name == 'push') || (github.event_name == 'pull_request' && github.event.pull_request.merged == true)
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository