diff --git a/src/Main_test.m b/src/Main_test.m
index d129e32..31f53eb 100644
--- a/src/Main_test.m
+++ b/src/Main_test.m
@@ -32,4 +32,4 @@ release = 0.1;
 x = DarellAmplitudeEnvelope(x, fs, attack,decay,sustain,release); %output new sound in time domain
 %play over 5 counts, should only hear 200hz
 playtime = 5;
-play_continuous(x, fs, playtime)
+play_continuous(x, fs, playtime)
\ No newline at end of file
diff --git a/src/amplify.m b/src/amplify.m
index 59c9d9e..153767b 100644
--- a/src/amplify.m
+++ b/src/amplify.m
@@ -1,5 +1,8 @@
 function output = amplify(input, multiplier)
-    %Amplifies the signal by multiplier
-    %By Conner Hsu
+    %input: a 1D array representing the sound signal in the time domain
+    %multiplier: a scalar that multiplier all values in the input array to
+    %            amplify or decrease the volume.
+    %Returns: input signal scaled by the multiplier in the time domain.
+    %Author: Conner Hsu
     output = input*multiplier;
 end
\ No newline at end of file
diff --git a/src/reverse.m b/src/reverse.m
index ed02c1f..586c606 100644
--- a/src/reverse.m
+++ b/src/reverse.m
@@ -1,5 +1,6 @@
 function output = reverse(input)
-    %Reverses an input signal
+    %input: a 1D array representing the sound signal in the time domain
+    %returns: the input signal with its elements in reverse order.
     %By Conner Hsu
     output = flip(input);
 end
\ No newline at end of file