Index: bin/sync/sync.8
===================================================================
--- bin/sync/sync.8
+++ bin/sync/sync.8
@@ -29,7 +29,7 @@
 .\"	@(#)sync.8	8.1 (Berkeley) 5/31/93
 .\" $FreeBSD$
 .\"
-.Dd May 31, 1993
+.Dd March 3, 2022
 .Dt SYNC 8
 .Os
 .Sh NAME
@@ -72,3 +72,12 @@
 .Nm
 utility appeared in
 .At v4 .
+.Pp
+Historically,
+a common practice was to run
+.Nm
+three times before invoking
+.Xr reboot 8
+or
+.Xr halt 8 .
+This has been unnecessary since the 1980s.