Link to flask-jwt-simple in README

Author: vimalloc

README.md

@@ -4,19 +4,31 @@
 [![PyPI version](https://badge.fury.io/py/Flask-JWT-Extended.svg)](https://badge.fury.io/py/Flask-JWT-Extended)
 [![Documentation Status](https://readthedocs.org/projects/flask-jwt-extended/badge/)](http://flask-jwt-extended.readthedocs.io/en/latest/)
 
-### Why Flask-JWT-Extended?
+### When to use Flask-JWT-Extended?
 
-Flask-JWT-Extended adds support for using JSON Web Tokens (JWT) to Flask for protecting views.
-
-This has several **optional** features built it to make working with JSON Web Tokens
+Flask-JWT-Extended not only adds support for using JSON Web Tokens (JWT) to Flask for protecting views,
+but also many helpful (and **optional**) features  built in to make working with JSON Web Tokens
 easier. These include:
 
 * Support for adding custom claims to JSON Web Tokens
+* Custom claims validation on received tokens
+* Creating tokens from complex objects or complex object from received tokens
 * [Refresh tokens](https://auth0.com/blog/refresh-tokens-what-are-they-and-when-to-use-them/)
 * Token freshness and separate view decorators to only allow fresh tokens
-* Token revoking
+* Token revoking/blacklisting
 * Storing tokens in cookies and CSRF protection
 
+### When *not* to use Flask-JWT-Extended?
+
+This extension is very opinionated about what claims need to exist in received
+JWTs to get all these extra features to work. If you are working with other JWT
+providers, only using Flask for rapid prototyping of your application, or do
+not care about any of these extra features, [Flask-JWT-Simple](https://github.com/vimalloc/flask-jwt-simple)
+may be a better fit for your application. It is the sister extension of this
+one (both maintained by me), which strips all of the extra features and opinionated
+JWT requirements out.
+
+
 ### Upgrading to the 3.x.x releases
 [See here](https://github.com/vimalloc/flask-jwt-extended/releases/tag/3.0.0) for
 help upgrading to the 3.x.x releases.