\fIfilename/from-to\fR
include the file from the given start position, up to the given end
position (not included).
+.TP
+\fBpad=\fIfilename\fR
+
+when this is given as first argument, the fused file is set up as a
+writable random-access file, where the write events are captured
+appended to the nominated "pad" file. The new content is inserted into
+the fused file but not the original files, and fragments are split up
+and adjusted as needed so as to make the write events appear as
+insertions inteo the fused file.
.SH EXAMPLES
If the mountpoint file doesn't exist, then \fBfusefile\fR creates it,
and removes it when unmounted.
+When a "pad" file is used, it is updated as an "ar" archive where each
+write event is a new member appended at the end. The "pad" member has
+two additional, newline-terminated text lines with the insertion
+position and the member size (ascii decimal digits), before the actual
+insertion event content.
+
.SH AUTHOR
Ralph Rönnquist <ralph.ronnquist@gmail.com>