diff --git a/docs/iTunesSD3gen.md b/docs/iTunesSD3gen.md
index 3e18da8..a8ee8fe 100644
--- a/docs/iTunesSD3gen.md
+++ b/docs/iTunesSD3gen.md
@@ -364,7 +364,7 @@ Here's the general layout of an iTunesSD file:<br>
 </td>
         <td>4<br>
 </td>
-        <td><br>
+        <td>Rythmbox IPod plugin sets this value always 0.<br>
 </td>
         <td><span style="font-family: 'Courier New',Courier,monospace;">112169</span><br>
 </td>
diff --git a/shuffle.py b/shuffle.py
index 186f157..22a4d4b 100755
--- a/shuffle.py
+++ b/shuffle.py
@@ -309,6 +309,7 @@ class Track(Record):
         text = os.path.splitext(os.path.basename(filename))[0]
         audio = mutagen.File(filename, easy = True)
         if audio:
+            # Note: Rythmbox IPod plugin sets this value always 0.
             self["stop_at_pos_ms"] = int(audio.info.length * 1000)
 
             artist = audio.get("artist", [u"Unknown"])[0]