Improve validation

README.md

@@ -229,15 +229,15 @@ import { ValidationResult, ValidatorMapFunc, ValidatorAction } from 'ember-chang
 
 ## Alternative Changeset
 
-Enabled in 4.1.0
+Enabled in 4.1.0. Experimental and subject to changes until 5.0.
 
 We now ship a ValidatedChangeset that is a proposed new API we would like to introduce and see if it jives with users. The goal of this new feature is to remove confusing APIs and externalize validations.
 
 - ✂️ `save`
 - ✂️ `cast`
 - ✂️ `merge`
 - `errors` are required to be added to the Changeset manually after `validate`
-- `validate` takes a callback with the sum of changes.  In user land you will call `changeset.validate((changes) => yupSchema.validate(changes))`
+- `validate` takes a callback with the sum of changes and original content to be applied to your externalized validation.  In user land you will call `changeset.validate((changes) => yupSchema.validate(changes))`
 
 ```js
 import Component from '@glimmer/component';