diff --git a/voicegardens/static/voicegardens.js b/voicegardens/static/voicegardens.js
index d4c712e..ef3286a 100644
--- a/voicegardens/static/voicegardens.js
+++ b/voicegardens/static/voicegardens.js
@@ -77,9 +77,13 @@ function stop() {
     // signal to the draw loop that we should generate a new shape
     newSoundJustRecorded = true;
 
-    // store sound properties from recording
+    // https://p5js.org/reference/#/p5.FFT/analyze
     pitch = fft.analyze();
+
+    // https://p5js.org/reference/#/p5.SoundFile/getPeaks
     amplitude = recording.getPeaks();
+
+    // https://p5js.org/reference/#/p5.SoundFile/duration
     duration = recording.duration();
   }
 }