(grob-property-description 'non-default boolean? "not set because of existence of a bar?.")
(grob-property-description 'note-character string? "character to print in a note head.")
(grob-property-description 'note-width number? "unit for horizontal translation, measured in staff-space.")
-(grob-property-description 'number-gap number? "size of the gap for the number in a tuplet.")
+(grob-property-description 'note-heads list? "List of note head grobs")
+(grob-property-description 'number-gap number? "size of the gap for tohe number in a tuplet.")
(grob-property-description 'old-accidentals list? "list of (pitch, accidental) pairs.")
(grob-property-description 'origin ly-input-location? "location in input file of the definition.")
(grob-property-description 'outer-stem-length-limit number? "catch