# Configure Validator List Threshold

A `rippled` server uses validators that meet a minimum intersection threshold between UNL publishers. This means a server only uses validators that exist on a number of validator lists, as defined by the server owner. New in: rippled 2.4.0

By default, the minimum threshold is calculated as follows:

- floor(`validator_list_keys` / 2) + 1
- If there are only 1 or 2 `validator_list_keys`, the threshold is `1`.


## Modify the Validators File

1. Edit the `validators.txt` file. The recommended installation places this file at:

```
/etc/opt/ripple/validators.txt
```
2. Add the following stanza and a valid threshold number.

```
[validator_list_threshold]
0
```


Be sure to save the changes and restart your server.

If this value is `0` or isn't set, the threshold will be calculated using the default method. The value also can't be larger than the number of `validator_list_keys`.

## See Also

- [validators method](/docs/references/http-websocket-apis/admin-api-methods/status-and-debugging-methods/validators)