href="@var{url}">} to the documents or by specifying
@samp{--base=@var{url}} on the command line.
+If the @var{file} is an external one, the document will be automatically
+treated as @samp{html} if the Content-Type matches @samp{text/html}.
+Furthermore, the @var{file}'s location will be implicitly used as base
+href if none was specified.
+
@cindex force html
@item -F
@itemx --force-html