diff --git a/IO_EXFastclock.h b/IO_EXFastclock.h
index 06d546f..54d4cf1 100644
--- a/IO_EXFastclock.h
+++ b/IO_EXFastclock.h
@@ -95,7 +95,8 @@ void _loop(unsigned long currentMicros) override{
   if (FAST_CLOCK_EXISTS==true) {
       uint8_t readBuffer[3];
       byte a,b;
-      #ifdef EXRAIL_ACTIVE
+      // I would like to use the FastClock without EXRAIL
+      // #ifdef EXRAIL_ACTIVE
         I2CManager.read(_I2CAddress, readBuffer, 3);
         // XXXX change this to save a few bytes
         a = readBuffer[0];
@@ -110,7 +111,7 @@ void _loop(unsigned long currentMicros) override{
         // Clock interval is 60/ clockspeed i.e 60/b seconds
         delayUntil(currentMicros + ((60/b) * 1000000));  
      
-      #endif
+      // #endif
     
   }
 }
diff --git a/config.example.h b/config.example.h
index 0f136f9..505d2b7 100644
--- a/config.example.h
+++ b/config.example.h
@@ -239,7 +239,10 @@ The configuration file for DCC-EX Command Station
 // SAMD/SAMC and STM32 have up to 6.)
 // To monitor a throttle on one or more serial ports, uncomment the defines below.
 // NOTE: do not define here the WiFi shield serial port or your wifi will not work.
-//
+// -------------------------------------
+// For Use with FastClock serial: uncomment the needed serial Port and 
+// FastClock will work, no further actions are needed
+// -------------------------------------
 //#define SERIAL1_COMMANDS
 //#define SERIAL2_COMMANDS
 //#define SERIAL3_COMMANDS
@@ -247,6 +250,12 @@ The configuration file for DCC-EX Command Station
 //#define SERIAL5_COMMANDS
 //#define SERIAL6_COMMANDS
 //
+// -------------------------------------
+// FastClock with I2C
+// uncomment the following Line and Set the used I2C Address
+//#define FAST_CLOCK_I2C 0x55 // default is 0x55
+// -------------------------------------
+//
 // BLUETOOTH SERIAL ON ESP32
 // On ESP32 you have the possibility to use the builtin BT serial to connect to
 // the CS.