docs: add notes #349 (#387)

Author: peaceiris

README.md

@@ -36,7 +36,12 @@ Three tokens are supported.
 | `deploy_key` | ✅️ | ✅️ | SSH | Necessary |
 | `personal_token` | ✅️ | ✅️ | HTTPS | Necessary |
 
-Notes: Actually, the `GITHUB_TOKEN` works for deploying to GitHub Pages but it has still some limitations. For the first deployment, we need to select the `gh-pages` branch or `master` branch on the repository settings tab. See [First Deployment with `GITHUB_TOKEN`](#%EF%B8%8F-first-deployment-with-github_token)
+Notes: Actually, the `GITHUB_TOKEN` works for deploying to GitHub Pages but it has still some limitations.
+For the first deployment, we need to select the `gh-pages` branch or `master` branch on the repository settings tab.
+See [First Deployment with `GITHUB_TOKEN`](#%EF%B8%8F-first-deployment-with-github_token)
+
+And you may need to push manually for the first deployment on a private repository.
+See [Issue #349](https://github.com/peaceiris/actions-gh-pages/issues/349)
 
 ### Supported Platforms