diff --git a/sounds/absorb-loop.mp3 b/sounds/absorb-loop.mp3
new file mode 100644
index 00000000..d89cdd06
Binary files /dev/null and b/sounds/absorb-loop.mp3 differ
diff --git a/sounds/license.json b/sounds/license.json
index dc157b3a..9e60e3a7 100644
--- a/sounds/license.json
+++ b/sounds/license.json
@@ -1,4 +1,12 @@
 {
+  "absorb-loop.mp3": {
+    "text": [
+      "Copyright 2018 University of Colorado Boulder"
+    ],
+    "projectURL": "http://phet.colorado.edu",
+    "license": "contact phethelp@colorado.edu",
+    "notes": "created by Ashton Morris (PhET Interactive Simulations)"
+  },
   "glow-loop-higher.mp3": {
     "text": [
       "Copyright 2018 University of Colorado Boulder"