update wording in overview

Author: wing328

README.md

@@ -11,7 +11,7 @@
 :warning: If the OpenAPI/Swagger spec is obtained from an untrusted source, please make sure you've reviewed the spec before using Swagger Codegen to generate the API client, server stub or documentation as [code injection](https://en.wikipedia.org/wiki/Code_injection) may occur :warning:
 
 ## Overview
-This is the swagger codegen project, which allows generation of client libraries automatically from a Swagger-compliant server.
+This is the swagger codegen project, which allows generation of API client libraries, server stubs and documentation automatically given an [OpenAPI Spec]((https://github.com/OAI/OpenAPI-Specification).
 
 Check out [Swagger-Spec](https://github.com/OAI/OpenAPI-Specification) for additional information about the Swagger project, including additional libraries with support for other languages and more.