-(grob-property-description 'merge-differently-dotted boolean? " Merge noteheads in collisions, even if they have a different number of dots. This normal notation for some types of polyphonic music. The value of this setting is used by @ref{note-collision-interface} .")
+
+(grob-property-description 'merge-differently-headed boolean? "Merge
+noteheads in collisions, even if they have different note heads. The
+smaller of the two heads will be rendered invisible. This used
+polyphonic guitar notation. The value of this setting is used by
+@ref{note-collision-interface} .")
+
+(grob-property-description 'merge-differently-dotted boolean? " Merge
+noteheads in collisions, even if they have a different number of
+dots. This normal notation for some types of polyphonic music. The
+value of this setting is used by @ref{note-collision-interface} .")