diff --git a/README.md b/README.md
index 59d5604..3f705e1 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,9 @@ Software for the ESP2866 that sends P1 smart meter data to Domoticz (with CRC ch
 - Place all files from this repository in a directory. Open the .ino file.
 - Adjust WIFI, Domoticz and debug settings at the top of the file
 - Compile and flash
+
+### Connection of the P1 meter to the ESP2866
+You need to connect the smart meter with a RJ11 connector. This is the pinout to use
+![RJ11 P1 connetor](http://gejanssen.com/howto/Slimme-meter-uitlezen/RJ11-pinout.png)
+
+Connect GND->GND on ESP, RTS->3.3V on ESP and RxD->any digital pin on ESP. In this sketch I use D5