diff --git a/voicegardens/static/voicegardens.js b/voicegardens/static/voicegardens.js
index b4e8dc1..6caa133 100644
--- a/voicegardens/static/voicegardens.js
+++ b/voicegardens/static/voicegardens.js
@@ -238,6 +238,9 @@ class GeneratedShape {
     this.destX = random(windowWidth);
     this.destY = random(windowHeight);
 
+    // the sound recording attached to this shape
+    this.recording = recording;
+
     this.initialise();
   }