diff --git a/sensorPI/main.c b/sensorPI/main.c
index 70f40fe5cf8b2d091d510dac423f2679e59686b4..808e673ce00902e6ae48b96b767c0d809141e2cd 100644
--- a/sensorPI/main.c
+++ b/sensorPI/main.c
@@ -13,7 +13,7 @@
 
 #include "gpio.h"     // 초음파
 #include "spi.h"      // 조도, 압력
-#include <wiringPi.h> // 온습도
+#include <wiringPi.h> // 온습도  (컴파일시 -lwiringPi 옵션 추가)
 
 #define bool   _Bool
 #define false  0