7.5: Playhead grid option

include/grid-controls.html

@@ -95,6 +95,12 @@
   <li><em>CD Frames</em>: shows one grid line per CD Frame (1/75<sup>th</sup> second)</li>
 </ul>
 
+<p>
+  Alternatively, Ardour can disable the usual musical/non-musical time grid
+  and make the current playhead position the only snappable target. To do
+  that, select the "Playhead" item in the drop-down list.
+</p>
+
 <p class="warning">
 The grid consist of lines running vertically in the edit canvas. When
 zooming too far out, the grid can become too coarse. Ardour tries not