# Using description fields

Use description fields as a workaround for unsupported OAS 3.0 features.

While there are some OAS 3.0 features which are not supported in API Contracts, description fields can be used instead.

For example, parameter serialization is not supported, but you can describe how and why a query parameter should be serialized in its description field.![Description example.](https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Resources/Images/ApiDesigner/shows_how_to_use_description_field_to_explain_query_parameter_serialization.png)