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diff --git a/doc/btt.1 b/doc/btt.1
index b9c9ee7..60d28ac 100644
--- a/doc/btt.1
+++ b/doc/btt.1
@@ -59,6 +59,8 @@ btt \- analyse block i/o traces produces by blktrace
[ \-V | \-\-version ]
.br
[ \-z <\fIoutput name\fR> | \-\-q2d\-latencies=<\fIoutput name\fR> ]
+.br
+[ \-Z | \-\-do\-active ]
.SH DESCRIPTION
@@ -339,6 +341,14 @@ respectively. The supplied argument provides the basis for the output
name for each device.
.RE
+.B \-Z
+.br
+.B \-\-do\-active
+.RS 4
+The \-Z will output files containing data which can be plotted showing
+per\-device (and total system) I/O activity.
+.RE
+
.SH AUTHORS
\fIbtt\fR was written by Alan D. Brunelle. This man page was created