diff --git a/include/midi-track-controls.html b/include/midi-track-controls.html
index 388975b..e39f3fe 100644
--- a/include/midi-track-controls.html
+++ b/include/midi-track-controls.html
@@ -26,11 +26,13 @@
 </p>
 <ul>
   <li>The scrollbar controls the range of pitches that are visible on the
-  track, as visualized by the piano keyboard. Drag the body of the scrollbar up
-  and down to display higher or lower pitches.</li>
-  <li>Drag the scrollbar handles to zooms in and out and increase and decrease the
-  range of visible pitches.</li>
-  <li>clicking on the piano plays the corresponding MIDI note for reference.</li>
+    track, as visualized by the piano keyboard. Dragging the body of the scrollbar up
+    and down displays higher or lower pitches.</li>
+  <li>Dragging the scrollbar handles zooms in and out and increases or decreases the
+    range of visible pitches.</li>
+  <li>Double clicking the scrollbar auto-adjusts the zooms to make the range of
+    visible pitches fit the actual content of the track.</li>
+  <li>Clicking on the piano plays the corresponding MIDI note for reference.</li>
 </ul>
 <p>
   A MIDI track's data may span any number of the 16 available MIDI channels, and sometimes it is