# Page Not Found

The URL `building-audiences/how-to-build-an-audience/understanding-audience-size-and-performance` does not exist.

You might be looking for one of these pages:
- [Syncing an Audience](https://support.sayprimer.com/primer/build-and-manage-audiences/building-an-audience/syncing-an-audience.md)
- [Audience Summary](https://support.sayprimer.com/primer/build-and-manage-audiences/building-an-audience/audience-summary.md)
- [Audience Preview](https://support.sayprimer.com/primer/build-and-manage-audiences/building-an-audience/audience-preview.md)
- [Refining an Audience](https://support.sayprimer.com/primer/build-and-manage-audiences/managing-audiences/refining-an-audience.md)
- [Matched Audience Size](https://support.sayprimer.com/primer/build-and-manage-audiences/managing-audiences/matched-audience-size.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/primer/build-and-manage-audiences/building-an-audience/syncing-an-audience.md`)
- Use `Accept: text/markdown` header for content negotiation