Ron's wording for Darrels feedback

Author: Phil Sturgeon

versions/3.0.3.md

@@ -102,6 +102,8 @@ The OpenAPI Specification is versioned using [Semantic Versioning 2.0.0](https:/
 
 The `major`.`minor` portion of the semver (for example `3.0`) SHALL designate the OAS feature set. Typically, *`.patch`* versions address errors in this document, not the feature set. Tooling which supports OAS 3.0 SHOULD be compatible with all OAS 3.0.\* versions. The patch version SHOULD NOT be considered by tooling, making no distinction between `3.0.0` and `3.0.1` for example.
 
+If an OAS definition has its minor version incremented, it MUST still be a valid definition for the new minor version. E.g., if we have a document that is 3.0.2 and we change the version to 3.1.0, then it MUST be a valid 3.1.0 document.
+
 An OpenAPI document compatible with OAS 3.\*.\* contains a required [`openapi`](#oasVersion) field which designates the semantic version of the OAS that it uses. (OAS 2.0 documents contain a top-level version field named [`swagger`](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#swaggerObject) and value `"2.0"`.)
 
 ### Format