diff --git a/README.rst b/README.rst
index 95303f82b..eb88622e7 100644
--- a/README.rst
+++ b/README.rst
@@ -20,7 +20,7 @@ PyModbus - A Python Modbus Stack
 Summary
 ------------------------------------------------------------
 
-Pymodbus is a full Modbus protocol implementation using twisted for its
+Pymodbus is a full Modbus protocol implementation using twisted/torndo/asyncio for its
 asynchronous communications core.  It can also be used without any third
 party dependencies (aside from pyserial) if a more lightweight project is
 needed.  Furthermore, it should work fine under any python version > 2.7
@@ -40,7 +40,7 @@ Client Features
   * TCP, UDP, Serial ASCII, Serial RTU, and Serial Binary
   * asynchronous(powered by twisted/tornado/asyncio) and synchronous versions
   * Payload builder/decoder utilities
-  * Pymodbus REPL for quick tests 
+  * Pymodbus REPL for quick tests
 
 ~~~~~~~~~~~~~~~~~~~~
 Server Features
@@ -88,16 +88,35 @@ For those of you that just want to get started fast, here you go::
     print(result.bits[0])
     client.close()
 
-For more advanced examples, check out the examples included in the
+For more advanced examples, check out the `Examples <https://pymodbus.readthedocs.io/en/dev/source/example/modules.html>`_ included in the
 respository. If you have created any utilities that meet a specific
 need, feel free to submit them so others can benefit.
 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Examples Directory structure
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+
+   examples
+   ├── common.      -> Common examples for clients and server (sync/async), Payload encoders and decoders.
+   ├── contrib.     -> Examples contributed by contributors. Serial Forwarder, Database contexts etc.
+   ├── functional.  -> Not actively maintained.
+   ├── gui.         -> Not actively maintained. If you are looking for UI,checkout `Modbus Simulator <https://github.com/riptideio/modbus-simulator>`_ or `Modbus Cli <https://github.com/dhoomakethu/modbus_sim_cli>`_
+   ├── tools.       -> Not actively maintained.
+   └── twisted.     -> Not actively maintained.
+
 Also, if you have questions, please ask them on the mailing list
 so that others can benefit from the results and so that I can
 trace them. I get a lot of email and sometimes these requests
 get lost in the noise: http://groups.google.com/group/pymodbus or 
 at gitter:  https://gitter.im/pymodbus_dev/Lobby
 
+.. important::
+   **Note For async clients, it is recomended to use `asyncio` as the async facilitator (Python 3.6 and above).**
+   **If using tornado make sure the tornado version is `4.5.3`.Other versions of tornado can break the implementation**
+
+
 ------------------------------------------------------------
 Pymodbus REPL (Read Evaluate Print Loop)
 ------------------------------------------------------------
diff --git a/pymodbus/version.py b/pymodbus/version.py
index 8e29cb9c9..2fc273abd 100644
--- a/pymodbus/version.py
+++ b/pymodbus/version.py
@@ -41,9 +41,7 @@ def __str__(self):
         return '[%s, version %s]' % (self.package, self.short())
 
 
-version = Version('pymodbus', 2, 4, 0, 'rc2')
-
-
+version = Version('pymodbus', 2, 4, 0)
 
 version.__name__ = 'pymodbus'  # fix epydoc error
 
diff --git a/requirements-tests.txt b/requirements-tests.txt
index 7b73548d3..eba656a38 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -14,6 +14,6 @@ sqlalchemy>=1.1.15
 #wsgiref>=0.1.2
 verboselogs >= 1.5
 tornado==4.5.3
-Twisted==17.1.0
+Twisted>=20.3.0
 zope.interface>=4.4.0
 asynctest>=0.10.0
diff --git a/setup.py b/setup.py
index af68ef914..adbe12f07 100644
--- a/setup.py
+++ b/setup.py
@@ -84,14 +84,14 @@
                       'sphinx_rtd_theme',
                       'humanfriendly'],
         'twisted': [
-            'twisted >= 12.2.0',
+            'twisted >= 20.3.0',
             'pyasn1 >= 0.1.4',
         ],
         'tornado': [
-            'tornado >= 4.5.3'
+            'tornado == 4.5.3'
         ],
         'repl': [
-            'click>=6.7',
+            'click>=7.0',
             'prompt-toolkit==2.0.4',
             'pygments==2.2.0'
         ]