+</p>
+<a name="mappings"></a>
+<h3 class="subsub">Button mappings</h3>
+<p>
+ Stylus buttons 2 and 3 (mouse middle and right buttons) can be mapped
+ to different tools using the appropriate submenus in the Options menu
+ (whereas the Tools menu and the toolbar buttons affect the primary tool
+ assigned to button 1). The default mapping is the eraser.
+</p>
+<p><b>Advanced configuration:</b>
+ if a secondary button is mapped to a drawing tool (pen, eraser, or
+ highlighter), the default is to "dynamically link" its settings to those
+ of the primary tool, which means that each drawing tool has common
+ settings (color, thickness, etc.) for all buttons.
+ Dynamic linking of brush settings
+ can be disabled by selecting the "Copy of current brush" option in the
+ "Button mapping" submenu. The settings of the tool for button 2 or 3 are
+ copied from the button 1 settings at the time when you select the option,
+ and afterwards they are no longer updated when the button 1 settings are
+ modified, thus making it possible to assign pens of different colors or
+ thicknesses to different buttons.
+</p>
+<p>
+ Another option that affects button mappings is the "Eraser tip" option.
+ If this option is turned on and the XInput extensions are enabled, then
+ the eraser tip of your tablet's stylus will automatically be remapped to
+ the eraser tool. This behavior, which overrides all other button mappings,
+ is most useful if your X server is configured to map the eraser tip of
+ your tablet's stylus to button 1.
+</p>