diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 50e69b5..babe5fd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,7 +13,7 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
-    # A workflow run is made up of one or more jobs that can run sequentially or in parallel
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
   build:
@@ -32,6 +32,7 @@ jobs:
       - run: mkdir pdf
       - run: mv *{.svg,.pdf} pdf/.
       - uses: peaceiris/actions-gh-pages@v3
+        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./pdf