Update README.md

README.md

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 ### moonPhase
 
-An esp32 library to get the moon phase angle and percentage of the moon that is illuminated.
+A library for esp32 to get the moon phase angle and percentage of the moon that is illuminated. (as seen from Earth)
+<br>Preferred methods to install is to use the Arduino IDE library manager. 
 
-#### Usage
+For esp8266 non-os or avr (Arduino) you can use the [steve-sienk fork](https://github.com/steve-sienk/moonPhaser-avr).
+
+
+#### Manual install
 
 1. Download the latest release and unpack in the Arduino `libraries` folder.
 2. Restart the Arduino IDE.
 
-#### Functions:
+#### Functions
 
 - `getPhase()` Get the current moon phase. (First set freeRTOS system time - see the esp32-sntp example)