diff --git a/packages/core/docs/index.md b/packages/core/docs/index.md
index 63bc002e4f..1827e9f275 100644
--- a/packages/core/docs/index.md
+++ b/packages/core/docs/index.md
@@ -182,7 +182,7 @@ Last, if you really really want to override the semantics generated by the lib,
 
 ## JSON Schema supporting status
 
-This component follows [JSON Schema](http://json-schema.org/documentation.html) specs. Due to the limitation of form widgets, there are some exceptions as follows:
+This component follows [JSON Schema](http://json-schema.org/documentation.html) specs. We currently support JSON Schema-07 by default, but we also support other JSON schema versions through the [custom schema validation](https://react-jsonschema-form.readthedocs.io/en/latest/validation/#custom-schema-validation) feature. Due to the limitation of form widgets, there are some exceptions as follows:
 
 * `additionalItems` keyword for arrays