diff --git a/sbin/ffsinfo/ffsinfo.8 b/sbin/ffsinfo/ffsinfo.8
index aaa2c4040ee0..c9d58747c33e 100644
--- a/sbin/ffsinfo/ffsinfo.8
+++ b/sbin/ffsinfo/ffsinfo.8
@@ -114,6 +114,7 @@ indirect block dump
 This allows to change the output filename where the dump is written to.
 The current default is
 .Pa /var/tmp/ffsinfo .
+If - is provided, output will be sent to stdout.
 .El
 .Sh EXAMPLES
 .Dl ffsinfo -l 1023 /dev/vinum/testvol