Index: head/sbin/setkey/setkey.8 =================================================================== --- head/sbin/setkey/setkey.8 +++ head/sbin/setkey/setkey.8 @@ -29,7 +29,7 @@ .\" .\" $FreeBSD$ .\" -.Dd April 5, 2017 +.Dd April 9, 2017 .Dt SETKEY 8 .Os .\" @@ -290,12 +290,13 @@ .Li any . .\" .It Fl r Ar size -Specify window size of bytes for replay prevention. +Specify the bitmap size in octets of the anti-replay window. .Ar size -must be decimal number in 32-bit word. +is a 32-bit unsigned integer, and its value is one eighth of the +anti-replay window size in packets. If .Ar size -is zero or not specified, replay check does not take place. +is zero or not specified, an anti-replay check does not take place. .\" .It Fl u Ar id Specify the identifier of the policy entry in SPD.