diff --git a/Code/C_Code/01.1.1_Blink/Blink.c b/Code/C_Code/01.1.1_Blink/Blink.c
index a09e364..13e67b9 100644
--- a/Code/C_Code/01.1.1_Blink/Blink.c
+++ b/Code/C_Code/01.1.1_Blink/Blink.c
@@ -7,14 +7,14 @@
 #include <wiringPi.h>
 #include <stdio.h>
 
-#define  ledPin    0	//define the led pin number
+#define  ledPin    12	//define the led pin number
 
 void main(void)
-{	
+{
 	printf("Program is starting ... \n");
-	
+
 	wiringPiSetup();	//Initialize wiringPi.
-	
+
 	pinMode(ledPin, OUTPUT);//Set the pin mode
 	printf("Using pin%d\n",ledPin);	//Output information on terminal
 	while(1){
diff --git a/wiringpi-gpio-numbering.png b/wiringpi-gpio-numbering.png
new file mode 100644
index 0000000..6af75e7
Binary files /dev/null and b/wiringpi-gpio-numbering.png differ