diff --git a/versions/3.1.0.md b/versions/3.1.0.md
index 53f48be6c2..5d142dfb3e 100644
--- a/versions/3.1.0.md
+++ b/versions/3.1.0.md
@@ -143,7 +143,7 @@ Data types in the OAS are based on the types supported by the [JSON Schema Speci
 Note that `integer` as a type is also supported and is defined as a JSON number without a fraction or exponent part. 
 Models are defined using the [Schema Object](#schemaObject), which is a superset of JSON Schema Specification Draft 2019-09.
 
-<a name="dataTypeFormat"></a>As defined by JSON Schema, data types can have an optional modifier property: `format`.
+<a name="dataTypeFormat"></a>As defined by the [JSON Schema Validation vocabulary](https://json-schema.org/draft/2019-09/json-schema-validation.html#rfc.section.7.3), data types can have an optional modifier property: `format`.
 OAS defines additional formats to provide fine detail for primitive data types.
 
 The formats defined by the OAS are: