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-rw-r--r--doc/blktrace.83
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/blktrace.8 b/doc/blktrace.8
index ab6a3f3..50b3a62 100644
--- a/doc/blktrace.8
+++ b/doc/blktrace.8
@@ -122,6 +122,9 @@ Specifies number of buffers to use. blktrace defaults to 4 sub buffers.
\-\-output=\fIfile\fR
.RS
Prepend \fIfile\fR to output file name(s)
+
+This only works when supplying a single device, or when piping the output
+via "-o -" with multiple devices.
.RE
\-r \fIrel-path\fR