diff --git a/README.md b/README.md
index cbd64bc..a15347d 100644
--- a/README.md
+++ b/README.md
@@ -9,11 +9,13 @@ Install python3-gpiozero
 
 `$ sudo apt update && sudo apt install python3-gpiozero`
 
-##analogSensor.py
+All of these examples are based on [the excellent documentation of the gpiozero library](https://gpiozero.readthedocs.io/en/stable/index.html)
+
+## analogSensor.py
 
 How to read analog values using a MCP3008 ADC (analog to digital converter)
 
-##distanceSensor.py
+## distanceSensor.py
 
 Using HC-SRO4 distance sensor
 
@@ -22,7 +24,7 @@ Hardware required:
 	* 330 & 470 ohm resistors
 	* HC-SRO4 Distance sensor
 
-##ldrLed.py
+## ldrLed.py
 
 Using an LDR to set the values of an LED, also smoothing and constraining sensor values in the process