+O_VISIBLE
+The field is displayed. If this option is off, display of the field is
+suppressed.
+.TP 5
+O_WRAP
+Words that do not fit on a line are wrapped to the next line. Words are
+blank-separated.
+.PP
+One extension option is defined (extensions are off by default):
+.TP 5
+O_DYNAMIC_JUSTIFY
+Permit dynamic fields to be justified, like static fields.