diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 7cf32a7c..66e5a52c 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -122,7 +122,8 @@ jobs:
         uses: quantecon/actions/publish-gh-pages@v0.11.1
         with:
           build-dir: _build/html
-          cname: python-programming.quantecon.org
+          # Custom domain (python-programming.quantecon.org): set in Settings → Pages. The Actions Pages
+          # deploy ignores a CNAME file, so publish-gh-pages' cname input has no effect.
           create-release-assets: 'true'
           asset-name: 'lecture-python-programming-html'
           github-token: ${{ secrets.GITHUB_TOKEN }}