> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# FileCitation

## Fields

| Field      | Type                                                              | Required             | Description |
| ---------- | ----------------------------------------------------------------- | -------------------- | ----------- |
| `file_id`  | *str*                                                             | :heavy\_check\_mark: | N/A         |
| `filename` | *str*                                                             | :heavy\_check\_mark: | N/A         |
| `index`    | *int*                                                             | :heavy\_check\_mark: | N/A         |
| `type`     | [components.FileCitationType](../components/filecitationtype.mdx) | :heavy\_check\_mark: | N/A         |