# Page Not Found

The URL `10.latest/extending` does not exist.

You might be looking for one of these pages:
- [Extensions Overview](https://docs.umbraco.com/umbraco-cms/customizing/extending-overview.md)
- [Unit Testing](https://docs.umbraco.com/umbraco-cms/implementation/unit-testing.md)
- [Extending the Help Menu](https://docs.umbraco.com/umbraco-cms/tutorials/extending-the-help-menu.md)
- [Routing](https://docs.umbraco.com/umbraco-cms/implementation/default-routing.md)
- [Composing](https://docs.umbraco.com/umbraco-cms/implementation/composing.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.umbraco.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.umbraco.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/umbraco-cms/customizing/extending-overview.md`)
- Use `Accept: text/markdown` header for content negotiation