man.th.extra2.max.length — Maximum length of extra2 in header/footer
Specifies the maximum permitted length of the
extra2 part of the man-page part of the
.TH title line header/footer. If the
extra2 content exceeds the maxiumum specified, it
is truncated down to the maximum permitted length.
The content of the extra2 field is usually
displayed in the left footer of the page and is typically "source"
data, often in the form
Name Version;
for example, "GTK+ 1.2" (from the gtk-options(7)
man page).
The default value for this parameter is reasonable (perhaps too liberal) but somewhat arbitrary. If you are processing pages with long "source" infromation, you may want to experiment with changing the value in order to achieve the correct aesthetic results.