man.th.extra3.suppress boolean man.th.extra3.suppress Suppress extra3 part of header/footer? 0 If the value of man.th.extra3.suppress is non-zero, then the extra3 part of the .TH title line header/footer is suppressed. 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).