# Page Not Found

The URL `platform/build-a-form/logic/custom-field-validation` does not exist.

You might be looking for one of these pages:
- [Custom Field Validation](https://docs.feathery.io/platform/build-forms/logic/custom-field-validation.md)
- [Field Validation](https://docs.feathery.io/platform/build-forms/advanced-logic/examples/field-validation.md)
- [Available Conditions](https://docs.feathery.io/platform/build-forms/logic/available-conditions.md)
- [Custom Fields](https://docs.feathery.io/platform/build-forms/elements/custom-fields.md)
- [Show Elements Conditionally](https://docs.feathery.io/platform/build-forms/logic/show-elements-conditionally.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/platform/build-forms/logic/custom-field-validation.md`)
- Use `Accept: text/markdown` header for content negotiation