diff --git a/src/DarellEnvelope.m b/src/DarellPitchEnvelope.m
similarity index 88%
rename from src/DarellEnvelope.m
rename to src/DarellPitchEnvelope.m
index ad6b37f..f0922ca 100644
--- a/src/DarellEnvelope.m
+++ b/src/DarellPitchEnvelope.m
@@ -1,4 +1,4 @@
-function output = DarellEnvelope(input, Fs, attack,decay,sustain,release) %percentages for attack, decay, sustain, release
+function output = DarellPitchEnvelope(input, Fs, attack,decay,sustain,release) %percentages for attack, decay, sustain, release
     len = length(input);
     T = (len-1)/Fs;
     attacktime = attack * T * Fs;
diff --git a/src/Main_test.m b/src/Main_test.m
index 0f1beb8..140b7d8 100644
--- a/src/Main_test.m
+++ b/src/Main_test.m
@@ -29,7 +29,7 @@ decay = 0.2;
 sustain = 0.2;
 release = 0.1;
 
-x = DarellEnvelope(x, fs, attack,decay,sustain,release);
+x = DarellPitchEnvelope(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)