-<h2>Mouse Wheel/Scroll</h2>
-<p>Ardour can make good use of a scroll wheel on your mouse, which can be utilized for a variety of purposes. Scroll wheels can generate both vertical scroll events (ScrollUp and ScrollDown) and/or horizontal events (ScrollLeft and ScrollRight). When appropriate, Ardour will differentiate between these two different scroll axes. Otherwise it will interpret ScrollDown and ScrollLeft as equivalent and similarly interpret ScrollUp and ScrollRight as equivalent. </p>
-<p>Typically, scrolling is used to adjust continuous controls (e.g. faders/knobs), or to scroll vertically or horizontally.</p>
+
+<h2>Scroll Wheel</h2>
+<p>
+ Ardour can make good use of a <dfn>scroll wheel</dfn> on your mouse, which can be
+ utilized for a variety of purposes. Scroll wheels generate vertical
+ scroll events, <kbd class="mouse">⇑</kbd> (ScrollUp) and
+ <kbd class="mouse">⇓</kbd> (ScrollDown). Some also emit horizontal
+ events, <kbd class="mouse">⇐</kbd> (ScrollLeft) and
+ <kbd class="mouse">⇒</kbd> (ScrollRight).
+</p>
+<p>
+ When appropriate, Ardour will differentiate between these two different
+ scroll axes. Otherwise it will interpret ScrollDown and ScrollLeft as
+ equivalent and similarly interpret ScrollUp and ScrollRight as equivalent.
+</p>
+<p>
+ Typically, scroll wheel input is used to adjust
+ <dfn>continuous controls</dfn> such as faders and knobs, or to scroll
+ vertically or horizontally inside a window.
+</p>