-\fIDESTINATION\fR already exists in the WIM image, then an overlay is attempted;
-this can be used to add multiple files to an existing directory in the WIM image
-in one command. If \fIDESTINATION\fR does not exist, then any prerequisite
-directories are created as needed to add the \fISOURCE\fR at that location.
+\fIDESTINATION\fR already exists in the WIM image, then an overlay is attempted
+if it is a directory; this feature can be used to add multiple files to an
+existing directory in the WIM image in one command. If \fIDESTINATION\fR does
+not exist in the WIM image, then any prerequisite directories are created as
+needed to add the \fISOURCE\fR at that location.