diff --git a/src/Main_test.m b/src/Main_test.m
index 140b7d8..259df39 100644
--- a/src/Main_test.m
+++ b/src/Main_test.m
@@ -11,7 +11,7 @@ duty = 0;
 x = generate_sine(amplitude, frequency, phase, fs, duration, duty);
 x = x + generate_sine(amplitude, (frequency+5), phase, fs, duration, duty);
 
-%play over 5 counts, should hear both frequencies, 5 beats between the 2 frequencies
+%play over 5 counts, should hear both frequencies, 5 beats per second between the 2 frequencies
 playtime = 5;
 play_continuous(x, fs, playtime)