-.Pp
-As with the
-.Fl W
-flag, multiple
-.Fl f
-options may be grouped and delimited with a comma. Using
-.Fl f Ns Ar ign-scope,no-ign-escape ,
-for example, will try to ignore scope and not ignore character-escape
-errors.
-.
+.Ss Output Options
+For the time being, only
+.Fl T Ns Ar html
+is the only mode with output options:
+.Bl -tag -width Ds
+.It Fl o Ns Ar style=style.css
+The file
+.Ar style.css
+is used for an external style-sheet. This must be a valid absolute or
+relative URI.
+.It Fl o Ns Ar base=http://base/
+The URL
+.Ar http://base/
+is used as a base URL for all relative links. This is useful when
+linking between documents via the
+.Sq \&Xr
+macro.
+.El