update readme

Author: NickKelly1

README.md

@@ -368,7 +368,7 @@ export class Post {
 
 ## Inheriting Validation decorators
 
-When you define a subclass which extends from another one, the subclass will automatically inherit the parent's decorators. If a property is redefined in the descendant class decorators will be applied on it both from that and the base class.
+When you define a subclass which extends from another one, the subclass will automatically inherit the parent's decorators. If a property is redefined in the descendant class decorators will be applied on it both from that and the base class. If a property-decorator pair is defined in both the sub-class and parent-class, the decorator from the sub-class will be used instead of the parent-class.
 
 ```typescript
 import { validate } from 'class-validator';