diff --git a/ESP8266ArduinoIDE/Blink/Blink.ino b/ESP8266ArduinoIDE/Blink/Blink.ino
index 9347841..7fd5c26 100644
--- a/ESP8266ArduinoIDE/Blink/Blink.ino
+++ b/ESP8266ArduinoIDE/Blink/Blink.ino
@@ -16,14 +16,14 @@
 
 // the setup function runs once when you press reset or power the board
 void setup() {
-  // initialize digital pin 13 as an output.
-  pinMode(2, OUTPUT);
+  // initialize digital pin 2 or the built-in LED as an output.
+  pinMode(LED_BUILTIN, OUTPUT);
 }
 
 // the loop function runs over and over again forever
 void loop() {
-  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
+  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
   delay(1000);              // wait for a second
-  digitalWrite(2, LOW);    // turn the LED off by making the voltage LOW
+  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
   delay(1000);              // wait for a second
 }