diff --git a/cmd/audio-player/adpcm.js b/cmd/audio-player/adpcm.js
index e1150e1a..958a295c 100644
--- a/cmd/audio-player/adpcm.js
+++ b/cmd/audio-player/adpcm.js
@@ -27,11 +27,13 @@ LICENSE
 	Reference algorithms for ADPCM compression and decompression are in part 6.
 */
 
+// Table of index changes (see spec).
 const indexTable = [
 	-1, -1, -1, -1, 2, 4, 6, 8,
 	-1, -1, -1, -1, 2, 4, 6, 8
 ];
 
+// Quantize step size table (see spec).
 const stepTable = [
 	7, 8, 9, 10, 11, 12, 13, 14,
 	16, 17, 19, 21, 23, 25, 28, 31,
diff --git a/cmd/audio-player/index.html b/cmd/audio-player/index.html
index 8578b10f..c7d7ab04 100644
--- a/cmd/audio-player/index.html
+++ b/cmd/audio-player/index.html
@@ -13,6 +13,14 @@
 <body style="height: 100%" onload="load();">
     <div class="card m-auto" style="width: 40rem;">
         <div class="card-body">
+            <div class="container-fluid">
+                URL: <input type="text" id="url" class="url mb-3 mx-3" onchange="load();"><button onclick="load();">Load</button>
+            </div>
+            <div class="container-fluid">
+                <a id="link" href=""></a>
+            </div>
+            <div style="height: 1rem">
+            </div>
             <div class="container-fluid">
                 <div class="form-group">
                     <input class="form-control-file" type="file" id="fileinput" onchange="processData();">
@@ -24,12 +32,6 @@
                     <source id="source" src="" type="audio/wav" />
                 </audio>
             </div>
-            <div class="container-fluid">
-                URL: <input type="text" id="url" class="url mb-3 mx-3" onchange="load();"><button onclick="load();">Load</button>
-            </div>
-            <div class="container-fluid">
-                <a id="link" href=""></a>
-            </div>
         </div>
     </div>
     <footer id="sticky-footer" class="footer fixed-bottom py-4 bg-dark text-white-50" style="width: 100%;">
