+A third option,
+.Fl m Ns Ar andoc ,
+which is also the default, determines encoding on-the-fly: if the first
+non-comment macro is
+.Sq \&.Dd
+or
+.Sq \&.Dt ,
+the
+.Xr mdoc 7
+parser is used; otherwise, the
+.Xr man 7
+parser is used.
+.Pp
+If multiple
+files are specified with
+.Fl m Ns Ar andoc ,
+each has its file-type determined this way. If multiple files are
+specified and
+.Fl m Ns Ar doc
+or
+.Fl m Ns Ar an
+is specified, then this format is used exclusively.
+.\" .Pp
+.\" The following escape sequences are recognised, although the per-format
+.\" compiler may not allow certain sequences.
+.\" .Bl -tag -width Ds -offset XXXX
+.\" .It \efX
+.\" sets the font mode to X (B, I, R or P, where P resets the font)
+.\" .It \eX, \e(XX, \e[XN]
+.\" queries the special-character table for a corresponding symbol
+.\" .It \e*X, \e*(XX, \e*[XN]
+.\" deprecated special-character format
+.\" .El