* `notify_email`: Email used for notifications.
* `description`: The instance’s description, can be seen in nodeinfo and ``/api/v1/instance``.
* `limit`: Posts character limit (CW/Subject included in the counter).
+* `chat_limit`: Character limit of the instance chat messages.
* `remote_limit`: Hard character limit beyond which remote posts will be dropped.
* `upload_limit`: File size limit of uploads (except for avatar, background, banner).
* `avatar_upload_limit`: File size limit of user’s profile avatars.
## Captcha
### Pleroma.Captcha
+
* `enabled`: Whether the captcha should be shown on registration.
* `method`: The method/service to use for captcha.
* `seconds_valid`: The time in seconds for which the captcha is valid.
### Captcha providers
+#### Pleroma.Captcha.Native
+
+A built-in captcha provider. Enabled by default.
+
#### Pleroma.Captcha.Kocaptcha
+
Kocaptcha is a very simple captcha service with a single API endpoint,
the source code is here: https://github.com/koto-bank/kocaptcha. The default endpoint
`https://captcha.kotobank.ch` is hosted by the developer.
rel: "ugc"
]
```
+
+## Custom Runtime Modules (`:modules`)
+
+* `runtime_dir`: A path to custom Elixir modules (such as MRF policies).