> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt.

## 0.49.0

**`(feat):`** The OpenAPI importer now supports respecting nullable properties in schemas. When enabled, nullable properties will
be preserved in the generated SDK. By default (without this setting), nullable properties are treated as `optional`.
To enable this, configure the setting in your `generators.yml`:

```yml
api:
 specs:
   - openapi: ./path/to/openapi.yml
     settings:
       respect-nullable-schemas: true
```

## 0.48.1

**`(fix):`** The Mintlify docs importer now correctly generates the proper display-name key in the docs.yml file.

## 0.48.0

**`(feat):`** Adds support for nullable types in the Fern definition, such as the following:

```yaml
types:
  User:
    properties:
      name: string
      email: `nullable<string>`
```