+\verb|qemu-nbd --bitmap|
+
+\verb|qemu-nbd --list|
+
+\verb|qemu-nbd --partition| deprecated
+
+\verb|qemu-nbd --tls-authz|
+
+\item[4.1, Aug 2019]
+
+\verb|qemu-nbd --pid-file|
+
+\item[4.2, later in 2019]
+
+\verb|NBD_CMD_CACHE|
+
+\verb|NBD_FLAG_CAN_MULTI_CONN| set automatically in some
+circumstances
+
+\verb|NBD_CMD_FLAG_FAST_ZERO|
+
+\end{description}