The following documentation is located at Template:rel-top3/doc. [edit]

Use at the top of long lists of related terms or derived terms (though the alias {{der-top3}} is more apt) to format them in three collapsing columns.

Use {{rel-mid3}} one-third and two-thirds of the way through the list. End the list with {{rel-bottom}}.

Takes one optional parameter, used as a heading; defaults to Related terms.