diff --git a/README.md b/README.md
index f86e74d..3289dbe 100644
--- a/README.md
+++ b/README.md
@@ -13,3 +13,20 @@ to on/off respectively. You can also set timer based events in Eve to control th
 words you can create a program of when you want the heating to go on or off. 
 
 Now updated to include a screen (SSD1306 OLED) and buttons to adjust up and down the target temperature. 
+
+
+GPIO used are as follows:- 
+
+  4 - DH22
+
+  12 - Temperature
+
+  13 - Temperature
+  
+  0 - Reset
+  
+  2 - LED 
+  
+  14 - SSD1306 SCL_PIN
+  
+  5 - SSD1306 SDA_PIN