+\fIDEST_WIMFILE\fR does not yet exist, since if \fIDEST_WIMFILE\fR exists, the
+compression type must be the same as that of \fIDEST_WIMFILE\fR.
+
+\fITYPE\fR may be "none", "maximum", or "fast". By default, it is the same as
+that of the input WIM file.
+
+You may also specify the actual names of the compression algorithms, "XPRESS"
+and "LZX", instead of "fast" and "maximum", respectively.
+.TP
+\fB--threads\fR=\fINUM_THREADS\fR
+Number of threads to use for compressing data. Default: autodetect (number of
+processors). Note: if exporting to an uncompressed WIM, or exporting to a WIM
+with the same compression type as the source WIM, additional threads will not
+be used, regardless of this parameter, since no data compression needs to be
+done in these cases.
+.TP
+\fB--rebuild\fR
+When exporting image(s) to an existing WIM: rebuild the entire WIM rather than
+appending data to the end of it. Rebuilding the WIM is slower, but will save a
+little bit of space that would otherwise be left as a hole in the WIM. Also see
+\fBimagex optimize\fR.
+.TP
+\fB--ref\fR="\fIGLOB\fR"
+File glob of additional split WIM parts that are part of the split WIM being
+exported. See \fBSPLIT_WIMS\fR.