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diff --git a/man/dmsetup.8.in b/man/dmsetup.8.in
index 5e5debe17..1b7424643 100644
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+++ b/man/dmsetup.8.in
@@ -114,6 +114,9 @@ Specify which fields to display.
.IP \fB-r|--readonly
.br
Set the table being loaded read-only.
+.IP \fB--readahead\ <sectors>
+.br
+Specify read ahead size in units of sectors.
.IP \fB--table\ <table>
.br
Specify a one-line table directly on the command line.