+.TP
+\fB--command\fR=\fISTRING\fR
+Instead of reading update commands from standard input, read a single update
+command directly from the string \fISTRING\fR specified on the command line.
+This option cannot be provided more than one time and cannot be used to specify
+more than one update command. Note that the \fISTRING\fR, as well as any
+paths containing spaces within the \fISTRING\fR must be appropriately quoted.
+If running from cmd.exe on Windows, you should use double quotes for the outer
+quotes and single quotes for the inner quotes. Example:
+.RS
+.RS
+.PP
+.nf
+@IMAGEX_PROGNAME@ update boot.wim 1 --command="add 'C:\\My Dir' '\\My Dir'"
+.RE
+.RE
+.fi