README.md in fitting-2.16.0 vs README.md in fitting-2.16.1

@@ -123,9 +123,18 @@
 
 More information on action coverage
 
 ![exmaple2](example2.png)
 
+## prefix name
+
+Setting the prefix name is optional. For example, you can do this:
+
+```yaml
+prefixes:
+  - openapi2_json_path: doc.json
+```
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at [github.com/funbox/fitting](https://github.com/funbox/fitting).
 This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.