# `mix igniter.add_extension`
[🔗](https://github.com/ash-project/igniter/blob/v0.8.3/lib/mix/tasks/igniter.add_extension.ex#L5)

Adds an extension to your `.igniter.exs` configuration file.

The extension can be the module name of an extension,
or the string `phoenix`, which maps to `Igniter.Extensions.Phoenix`.

## Example

```bash
mix igniter.add_extension phoenix
```

# `igniter`

---

*Consult [api-reference.md](api-reference.md) for complete listing*