diff --git a/usr.sbin/extattrctl/extattrctl.8 b/usr.sbin/extattrctl/extattrctl.8
index 96165b2e3758..511e4e693483 100644
--- a/usr.sbin/extattrctl/extattrctl.8
+++ b/usr.sbin/extattrctl/extattrctl.8
@@ -166,6 +166,7 @@ Disable the attribute named md5 on the root file system.
 .Pp
 Stop extended attributes on the root file system.
 .Sh SEE ALSO
+.Xr ffs 7 ,
 .Xr getextattr 8 ,
 .Xr setextattr 8 ,
 .Xr extattr 9