Update README.md

README.md

@@ -42,7 +42,14 @@ The Red Reactor UPS for Raspberry Pi zero, Pi Model 2/3 and Pi Model 4!
 
 **Installation**
 
-Open a terminal and type the following
+The application assumes you already have python3 installed (usually the case on Raspberry Pi OS).  
+However, you also need to install the python INA219 library, as follows from a terminal window:
+
+```
+sudo pip3 install pi-ina219
+```
+
+Then, type the following
 
 ```
   cd
@@ -74,6 +81,8 @@ and creates or updates the ~/.config/lxsession/LXDE-pi/autostart file.
 Please adjust your chosen battery capacity by editing ~/.config/lxpanel/LXDE-pi/panels/redreactor.conf
 (given in mAh for total capacity)
 
+When the widget is running, you can check for startup errors and battery information at ~/RedReactor_batterylog.txt
+
 Reboot your pi.