Description

Specifies the maximum permitted length of the extra3 part of the man-page .TH title line header/footer. If the extra3 content exceeds the maxiumum specified, it is truncated down to the maximum permitted length.

The content of the extra3 field is usually displayed in the middle header of the page and is typically a "manual name"; for example, "GTK+ User's Manual" (from the gtk-options(7) man page).

The default value for this parameter is reasonable but somewhat arbitrary. If you are processing pages with long "manual names" -- or especially if you are processing pages that have both long "title" parts (command/function, etc. names) and long manual names -- you may want to experiment with changing the value in order to achieve the correct aesthetic results.