diff --git a/versions/3.0.md b/versions/3.0.md
index 1d6a2d02a9..099de6aeef 100644
--- a/versions/3.0.md
+++ b/versions/3.0.md
@@ -855,7 +855,7 @@ Field Name | Type | Description
##### Patterned Fields
Field Pattern | Type | Description
---|:---:|---
-{[HTTP Status Code](#httpCodes)} | [Response Object](#responseObject) | [Reference Object](#referenceObject) | Any [HTTP status code](#httpCodes) can be used as the property name (one property per HTTP status code). Describes the expected response for that HTTP status code. [Reference Object](#referenceObject) can be used to link to a response that is defined at the [OpenAPI Object's responses](#oasResponses) section.
+{[HTTP Status Code](#httpCodes)} | [Response Object](#responseObject) | [Reference Object](#referenceObject) | Any [HTTP status code](#httpCodes) can be used as the property name (one property per HTTP status code). Describes the expected response for that HTTP status code. [Reference Object](#referenceObject) can be used to link to a response that is defined at the [OpenAPI Object's responses](#oasResponses) section. This field must quoted for compatibility between JSON and YAML (i.e. "200"), and may contain the uppercase character, `X` to designate a wildcard, such as `2XX` to represent all response codes between `[200-299]`.
^x- | Any | Allows extensions to the OpenAPI Schema. The field name MUST begin with `x-`, for example, `x-internal-id`. The value can be `null`, a primitive, an array or an object. See [Vendor Extensions](#vendorExtensions) for further details.