diff --git a/GIT_arduino_sprinkler_ntp_1relais.ino b/GIT_arduino_sprinkler_ntp_1relais.ino
index 917c32d..6a13e6d 100644
--- a/GIT_arduino_sprinkler_ntp_1relais.ino
+++ b/GIT_arduino_sprinkler_ntp_1relais.ino
@@ -5,7 +5,7 @@
 const char* ssid     = "foo";
 const char* password = "bar";
 //const int RELAIS = D8; //WEMOS D1 PIN D8
-const int RELAIS = D2;
+const int RELAIS = D2; // "D2" PIN on WEMOS D1. On generic ESP 8266 boards like ESP-01 use PIN "3" => "GPIO2"
 
 WiFiUDP ntpUDP;
 NTPClient timeClient(ntpUDP);