venti(8) says "See venti(8)" in the second paragraph
of the description. It means venti(6).

Reference: /n/sources/patch/applied/venti8-cyclical-reference
Date: Thu Dec 13 02:20:45 CET 2007
Signed-off-by: anthony@strand1.com

--- /sys/man/8/venti	Thu Dec 13 02:20:00 2007
+++ /sys/man/8/venti	Thu Dec 13 02:19:59 2007
@@ -40,7 +40,7 @@
 Venti
 is a SHA1-addressed archival storage server.
 See 
-.IR venti (8)
+.IR venti (6)
 for a full introduction to the system.
 This page documents the structure and operation of the server.
 .PP