diff --git a/release-notes.md b/release-notes.md
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--- a/release-notes.md
+++ b/release-notes.md
@@ -1,59 +1,32 @@
-# Version 2.0
-
-The MachineMotion Python API V2.0 aims at simplifying the interfaces to the digital input / outputs and the encoder position.
-
-## Compatibility
-
- The Python API V2 requires MachineMotion version V1.12 or newer.
- 
- Please use [mm-python-api V1.6.7](https://github.com/VentionCo/mm-python-api/releases/tag/v1.6.7) for prior version of MachineMotion software.
-
-## Interface changes
-- **Obsoleted interfaces**
-    - attachControlDevice
-    - dettachControlDevice
-    - readControlDevice
-    - writecontrolDevice
-- **New interfaces:**
-    - isIoExpanderAvailable(device)
-    - digitalRead(device, pin)
-    - digitalWrite(device, pin, value)
-    - readEncoderRealtimePosition(device)
-
-
-# Version 1.6.7
-
-Date: July 16<sup>th</sup>, 2019
-
-## Improvements:
-- Added support for Python3 and Python2.
-- Updated the REAMDME to include the new MQTT library dependency.
-
-
-# Version: 1.6.6
-
-Date:  July 4<sup>th</sup> 2019
-
-## Bug Fixes:
-- Fix distance of movement smaller then requested on linear axis.
-
-## Improvements:
-- All examples import statement are now version independant.
-
-<br><br>
-# Version: 1.6.5
-
-Date:  June 4<sup>th</sup> 2019
-
-## Bug Fixes:
-- Fix Line Number mismatch with the help of the 'resend' message
-- Fix application hang on termination 
-
-## New Features:
-- Support for the rotatory indexer with constants for mechanical gain.
-
-## Improvements:
-- Added more examples for each sensor port for the different control devices functions.
-- Auto reconnect on connection loss
-- Instead of starting a new thread each 0.1 seconds, we now start one thread at the beginning and keep it alive forever to receive messages from the server
-
+## Python API Version 4.2
+Date: September 8<sup>th</sup> 2021
+
+Python API supports Python 3.7.3 and older. Python-API v4.2 has been updated to support the following:
+
+  - For Linux and Mac machines, it is now possible to install the Python api system-wide. To update or install a Python API version, navigate to the folder with the new Python API and run:
+   
+    `make install`
+  - Simplified declaration of a new MachineMotion object. Creation of a MachineMotionv2 can be done as follows:
+
+    `mm = MachineMotionV2()`
+    
+    `mm = MachineMotionV2OneDrive()`
+  - Push Button and Power Switch modules are now supported.
+  - Axes containing multiple drives can be configured and controlled as one.
+  - Combined moves with the 4th drive are now allowed.
+  - Enclosed ball screw is now supported.
+  - Some function names have been changed to reflect MachineLogic naming. The old names are deprecated, but will still work. These functions are:
+     - emitSpeed -> setSpeed
+     - emitAcceleration -> setAcceleration
+     - emitRelativeMove -> moveRelative
+     - emitAbsoluteMove -> moveToPosition
+     - emitCombinedAxesRelativeMove -> moveRelativeCombined
+     - emitCombinedAxesAbsoluteMove -> moveToPositionCombined
+     - emitContinuousMove -> moveContinuous
+     - emitHome -> moveToHome
+     - emitHomeAll -> moveToHomeAll
+   - There is no directions field in moveRelative, moveRelativeCombined. Simply put a positive or negative distance to set the direction of movement.
+   - moveToHome is not a blocking function. To block a script while homing, simply add a waitForMotionCompletion when desired.
+
+## Known Issues
+  - If using the python API to control motors, you must first configure your actuators with the python API. Failure to do so can result in unexpected behaviour.