diff --git a/Modbus/inc/ModbusMaster.h b/Modbus/inc/ModbusMaster.h
index 18e7978..21e2254 100644
--- a/Modbus/inc/ModbusMaster.h
+++ b/Modbus/inc/ModbusMaster.h
@@ -53,6 +53,7 @@ Set to 1 to enable debugging features within class:
 #include "Arduino.h"
 #else
 //#include "WProgram.h"
+#include "SerialPort.h"
 #include <stdint.h>
 #include <cstddef>
 #endif
@@ -243,10 +244,10 @@ class ModbusMaster
     uint16_t _u16WriteAddress;                                   ///< slave register to which to write
     uint16_t _u16WriteQty;                                       ///< quantity of words to write
     uint16_t _u16TransmitBuffer[ku8MaxBufferSize];               ///< buffer containing data to transmit to Modbus slave; set via SetTransmitBuffer()
-    uint16_t* txBuffer; // from Wire.h -- need to clean this up Rx
+    uint16_t* txBuffer;
     uint8_t _u8TransmitBufferIndex;
     uint16_t u16TransmitBufferLength;
-    uint16_t* rxBuffer; // from Wire.h -- need to clean this up Rx
+    uint16_t* rxBuffer;
     uint8_t _u8ResponseBufferIndex;
     uint8_t _u8ResponseBufferLength;
 
@@ -255,6 +256,8 @@ class ModbusMaster
     static const uint8_t ku8MBReadDiscreteInputs         = 0x02; ///< Modbus function 0x02 Read Discrete Inputs
     static const uint8_t ku8MBWriteSingleCoil            = 0x05; ///< Modbus function 0x05 Write Single Coil
     static const uint8_t ku8MBWriteMultipleCoils         = 0x0F; ///< Modbus function 0x0F Write Multiple Coils
+    static const uint8_t ku8MBWriteMultipleRegisters     = 0x10; ///< Modbus function 0x10 Write Multiple Registers
+
 
     // Modbus function codes for 16 bit access
     static const uint8_t ku8MBReadHoldingRegisters       = 0x03; ///< Modbus function 0x03 Read Holding Registers
diff --git a/Modbus/inc/SerialPort.h b/Modbus/inc/SerialPort.h
index f84581d..6e89b6e 100644
--- a/Modbus/inc/SerialPort.h
+++ b/Modbus/inc/SerialPort.h
@@ -1,5 +1,3 @@
-
-
 #ifndef SERIALPORT_H_
 #define SERIALPORT_H_
 
diff --git a/Modbus/src/ModbusMaster.cpp b/Modbus/src/ModbusMaster.cpp
index 4aef169..4dee284 100644
--- a/Modbus/src/ModbusMaster.cpp
+++ b/Modbus/src/ModbusMaster.cpp
@@ -39,6 +39,7 @@ Arduino library for communicating with Modbus slaves over RS232/485 (via RTU pro
 #elif defined(ARDUINO_ARCH_SAM)
   UARTClass* MBSerial = &Serial; ///< Pointer to Serial class object
 #else
+//In the case of undefined Serial the code should still function
 //  #error "This library only supports boards with an AVR or SAM processor. Please open an issue at https://github.com/4-20ma/ModbusMaster/issues and indicate which processor/platform you're using."
 #endif