+\fB\-x\fR | \fB\-\-change\fR\r
+Modify existing block, or add it if it does not exist but the begin \r
+mark can be found. Does basically the same as regular insert without\r
+\-\-allow\-multiple but on other way (in-place). Thus those two options\r
+are mutually exclusive.\r
+.TP\r