+Their effects are subject to change between version without warning.
+You should consult the source code for details of their effects.
+.TP
+.B \-\-min \fIFRAMES\fR, \fB\-m \fIFRAMES\fR
+Specifies the buffer low watermark in frames.
+This also acts as the target buffer occupancy.
+.TP
+.B \-\-max \fIFRAMES\fR, \fB\-x \fIFRAMES\fR
+Specifies the maximum buffer size in frames.
+If there are this many frames in the buffer then reading from the
+network socket will be suspended.
+The default is twice the \fB\-\-min\fR value.
+.TP
+.B \-\-rcvbuf \fIBYTES\fR, \fB\-R \fIBYTES\fR
+Specifies socket receive buffer size.
+The default is not to change the buffer size, i.e. you get whatever the
+local operating system chooses.
+The buffer size will not be reduced below the operating system's default.