diff --git a/AvrUartBaud.c b/AvrUartBaud.c
index bc16f4a..861fa4f 100644
--- a/AvrUartBaud.c
+++ b/AvrUartBaud.c
@@ -1,11 +1,15 @@
 /*********************************************************************************/
 /*
- * Author : Jung Hyun Gu
+ * Author : Jeong Hyun Gu
  * File name : AvrUartBaud.c
 */
 /*********************************************************************************/
 #include "AvrUartBaud.h"
 /*********************************************************************************/
+#if(AVR_UART_BAUD_REVISION_DATE != 20161108)
+#error wrong include file. (AvrUartBaud.h)
+#endif
+/*********************************************************************************/
 /** Global variable **/
 
 
@@ -17,27 +21,27 @@ char AvrUartBaudControlInit(tag_UartBaudControl *BaudCtrl, long CpuClock, unsign
 			- BaudCtrl : 'tag_UartBaudControl'의 인스턴스 주소.
 			- CpuClock : Target CPU의 Clock Speed.
 			- pUBRRL, pUBRRH : Uart Baud Rate Register의 주소.
-		
+
 		2) Description
 			- Baud를 관리할 'tag_UartBaudControl' 인스턴스를 초기화한다.
 			- 본 초기화는 한번만 실행하면 된다.
 			- 다음 함수들은 반드시 본 초기화를 실행한 후 호출해야 한다.
-				AvrUartBaudChange();		
+				AvrUartBaudChange();
 	*/
-	
+
 	if((pUBRRL) == null || (pUBRRH == null))
 	{
 		return false;
 	}
-	
+
 	BaudCtrl->CpuClock = CpuClock;
 	BaudCtrl->Baud = BAUD_INIT;
-	
+
 	BaudCtrl->pUBRRL = pUBRRL;
 	BaudCtrl->pUBRRH = pUBRRH;
-	
+
 	BaudCtrl->Bit.Init = true;
-	
+
 	return BaudCtrl->Bit.Init;
 }
 /*********************************************************************************/
@@ -47,47 +51,47 @@ void AvrUartBaudChange(tag_UartBaudControl *BaudCtrl, Enum_BaudRate Baud)
 		1) Parameter
 			- BaudCtrl : 'tag_UartBaudControl'의 인스턴스 주소.
 			- Baud : 변경하고자 하는 baud rate.
-			
+
 		2) Description
 			- 'BaudCtrl' 인스턴스의 baud rate를 변경한다.
 	*/
-	
+
 	if(BaudCtrl->Bit.Init == false)
 	{
 		return;
 		/* error */
 	}
-	
+
 	if(BaudCtrl->Baud != Baud)
 	{
 		BaudCtrl->Baud = Baud;
-		
+
 		switch(Baud)
 		{
 			default	:
 			case	BAUD_9600	:
 				*BaudCtrl->pUBRRH = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 9600, 0) >> 8);
-				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 9600, 0) & 0x00FF);   
+				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 9600, 0) & 0x00FF);
 			break;
-						
+
 			case	BAUD_19200	:
 				*BaudCtrl->pUBRRH = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 19200, 0) >> 8);
-				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 19200, 0) & 0x00FF);   
+				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 19200, 0) & 0x00FF);
 			break;
-						
+
 			case	BAUD_38400	:
 				*BaudCtrl->pUBRRH = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 38400, 0) >> 8);
-				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 38400, 0) & 0x00FF);   
+				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 38400, 0) & 0x00FF);
 			break;
-						
+
 			case	BAUD_57600	:
 				*BaudCtrl->pUBRRH = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 57600, 0) >> 8);
-				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 57600, 0) & 0x00FF);   
+				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 57600, 0) & 0x00FF);
 			break;
-						
+
 			case	BAUD_115200	:
 				*BaudCtrl->pUBRRH = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 115200, 0) >> 8);
-				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 115200, 0) & 0x00FF);   
+				*BaudCtrl->pUBRRL = (unsigned char) (GET_UBRR(BaudCtrl->CpuClock, 115200, 0) & 0x00FF);
 			break;
 		}
 	}
diff --git a/AvrUartBaud.h b/AvrUartBaud.h
index f1d5796..b46d281 100644
--- a/AvrUartBaud.h
+++ b/AvrUartBaud.h
@@ -1,18 +1,21 @@
 /*********************************************************************************/
 /*
- * Author : Jung Hyun Gu
+ * Author : Jeong Hyun Gu
  * File name : AvrUartBaud.h
 */
 /*********************************************************************************/
 #ifndef __AVR_UART_BAUD_H__
 #define	__AVR_UART_BAUD_H__
 /*********************************************************************************/
+#define AVR_UART_BAUD_REVISION_DATE		20161108
+/*********************************************************************************/
 /** REVISION HISTORY **/
 /*
+	2016. 11. 08.					- revision valid check 추가.
+	Jung Hyun Gu
+
 	2016. 10. 28.					- 초기버전.
 	Jung Hyun Gu
-	
-	
 */
 /*********************************************************************************/
 /**Define**/
@@ -44,12 +47,12 @@ typedef struct
 	struct
 	{
 		unsigned char Init		:		1;									//초기화
-		
+
 	}Bit;
-	
+
 	unsigned char volatile __tiny *pUBRRL;					//
 	unsigned char volatile __tiny *pUBRRH;					//
-	
+
 	long CpuClock;																	//CPU클록
 	Enum_BaudRate Baud;															//
 }tag_UartBaudControl;
@@ -62,14 +65,3 @@ void AvrUartBaudChange(tag_UartBaudControl *BaudCtrl, Enum_BaudRate Baud);
 
 /*********************************************************************************/
 #endif //__AVR_UART_BAUD_H__
-
-
-
-
-
-
-
-
-
-
-