fix!: add advanced use section in README.md

README.md

@@ -24,10 +24,24 @@ yarn dlx expo install react-native-web@~0.18.9 react-dom@18.1.0 @expo/webpack-co
 
 - This is [second][patch-version-pr] PR with fixes.
 
+### Note on existing repo versioning
+
+This example assumes `release-please` being used from the initial app bootstrap. If you already have an app running and want to start with some existing version consider using bootstrapping `release-please` with [.release-please-manifest.json][release-please-initial-version] file.
+For this package context of this file might look something like.
+
+```json
+{
+  "packages": {
+    ".": "2.0.0"
+  }
+}
+```
+
 [expo-app-get-started]: https://docs.expo.dev
 [release-please-github-repo]: https://github.com/googleapis/release-please
 [release-please-github-action-repo]: https://github.com/google-github-actions/release-please-action
 [release-please-doc-arbitrary-file-update]: https://github.com/googleapis/release-please/blob/main/docs/customizing.md#updating-arbitrary-json-files
 [initial-version-pr]: https://github.com/dmi3y/expo-release-please-example/pull/1/files
 [readme-code-arbitrary-file-update]: https://github.com/dmi3y/expo-release-please-example/blob/main/README.md?plain=1#L19
 [patch-version-pr]: https://github.com/dmi3y/expo-release-please-example/pull/2
+[release-please-initial-version]: https://github.com/googleapis/release-please/blob/main/docs/manifest-releaser.md#initial-version