diff --git a/ul_wave.c b/ul_wave.c
index 3a2f6b06537f139ad58d2f3f33e1e706fa55d9af..f0776c3ff189530b6c1de36a5de70ade79d31b6b 100644
--- a/ul_wave.c
+++ b/ul_wave.c
@@ -185,7 +185,7 @@ do {
      while (GPIORead(PIN2) == 0 && timeout > 0) {
         start_t = clock();
             timeout -= 1000;
-        // 1밀리초(1000마이크로초)씩 감소
+        // 1밀리초(1000마이크로초)씩 감소시킴
         usleep(1000); 
     }