Update 4 1 horizontal scalar field

4-1-horizontal-scalar-field.md

@@ -33,7 +33,7 @@ On _Horizontal Plane_ menu category of _Menu Bar_, you can select one of the fol
 * Raster : show distribution with smoothly filled colors
 * Dot : show distribution with colored dots for grid points
 
-Each menu button has drop-down submenu, where you can set various options for each visualization style.
+Each menu button has drop-down submenu, where you can set various options for each visualization style. For example, you can display character labels ("H" or "C" for temperature, and "H" or "L" for geopotential height) for the peaks of the distribution.
 
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