diff --git a/man/bmon.8 b/man/bmon.8
index 07e0148..dc43954 100644
--- a/man/bmon.8
+++ b/man/bmon.8
@@ -75,6 +75,11 @@ Set interval in seconds in which the rate per counter is calculated.
 The default is 1.0 seconds.
 .RE
 .PP
+\fB \-b\fR
+.RS 4
+Show rates in bits per second instead of bytes per second.
+.RE
+.PP
 \fB \-L\fR, \fB\-\-lifetime=\fRFLOAT
 .RS 4
 Set lifetime of an element in seconds before it is no longer displayed