To include additional configuration files in a Spring Boot project, the _____ property can be used.

In Spring Boot, you can include additional configuration files using the spring.config.name property. This property allows you to specify the base name of the configuration files to be loaded. The default value is "application," so if you have a custom configuration file like "myapp.properties," you can specify it as spring.config.name=myapp in your application.properties or application.yml file.