diff --git a/.github/workflows/upload-gh-pages.yml b/.github/workflows/upload-gh-pages.yml
index 9e78d0a1b..e545c0bf6 100644
--- a/.github/workflows/upload-gh-pages.yml
+++ b/.github/workflows/upload-gh-pages.yml
@@ -34,7 +34,7 @@ jobs:
 
       - name: Make documents
         run: |
-          python make_docs.py
+          PYTHONPATH=. python build_util/make_docs.py
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
diff --git a/README.md b/README.md
index 5f4594717..2c66e623e 100644
--- a/README.md
+++ b/README.md
@@ -612,7 +612,7 @@ VOICEVOX エディターにうまく読み込ませられないときは、エ
 次のコマンドで API ドキュメントを手動で作成することができます。
 
 ```bash
-python make_docs.py
+PYTHONPATH=. python build_util/make_docs.py
 ```
 
 ### GitHub Actions
diff --git a/make_docs.py b/build_util/make_docs.py
similarity index 100%
rename from make_docs.py
rename to build_util/make_docs.py