# cartNoteUpdate

Updates the note for an existing cart.

## Authentication

> **Public Access**: Accessible with the public API key

## Mutation Structure

```graphql
mutation {
  cartNoteUpdate(id: String!, note: String!) {
    cart {
      # Cart fields
    }
    userErrors {
      # UserError fields
    }
  }
}
```

## Input Arguments

| Argument | Type | Required | Description |
|----------|------|----------|-------------|
| id | String | Yes | The ID of the cart to update the note for |
| note | String | Yes | The new note for the cart |

## Return Type

[CartNoteUpdatePayload](/reference/storefront/v1/objects/cart-note-update-payload) - Payload returned by the cartNoteUpdate mutation. Contains the updated cart and any user errors that occurred during the operation.

## Example

```graphql
mutation {
  cartNoteUpdate(id: "eyJhbGciOiJIUzI1NiJ9...", note: "Please leave at front door") {
    cart {
      id
      note
    }
    userErrors {
      field
      message
    }
  }
}
```

## Related Types

- [CartNoteUpdatePayload](/reference/storefront/v1/objects/cart-note-update-payload)