diff --git a/MPPT/read.py b/MPPT/read.py
index 1baa346..63af67d 100644
--- a/MPPT/read.py
+++ b/MPPT/read.py
@@ -7,6 +7,12 @@
                         
 Chargeur solaire Victron MPPT interface UART
 
+MPPT connections
+5V / Rx / TX / GND
+RPI connection
+-- / GPIO9 / GPIO8 / GND
+* pas besoin de connecter le 5V (le GND uniquement)
+
 typical response from uart:
 
 PID     0xA075          ->product ID