diff --git a/lib/libc/gen/signal.3 b/lib/libc/gen/signal.3
index ad94868a6adf..4e32d8cb75e7 100644
--- a/lib/libc/gen/signal.3
+++ b/lib/libc/gen/signal.3
@@ -28,7 +28,7 @@
 .\"     @(#)signal.3	8.3 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd June 7, 2004
+.Dd December 1, 2017
 .Dt SIGNAL 3
 .Os
 .Sh NAME
@@ -263,6 +263,10 @@ or
 .Xr tty 4
 .Sh HISTORY
 The
+.Fn signal
+function appeared in
+.At v4 .
+The current
 .Nm
 facility appeared in
 .Bx 4.0 .
diff --git a/lib/libc/sys/dup.2 b/lib/libc/sys/dup.2
index ca5f4aa00260..a617ab0da9e6 100644
--- a/lib/libc/sys/dup.2
+++ b/lib/libc/sys/dup.2
@@ -28,7 +28,7 @@
 .\"     @(#)dup.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd June 1, 2013
+.Dd December 1, 2017
 .Dt DUP 2
 .Os
 .Sh NAME
@@ -163,7 +163,9 @@ system calls are expected to conform to
 .Sh HISTORY
 The
 .Fn dup
-and
+function appeared in
+.At v3 .
+The
 .Fn dup2
-functions appeared in
+function appeared in
 .At v7 .
diff --git a/lib/libc/sys/getuid.2 b/lib/libc/sys/getuid.2
index a0d0e4865697..c0b06db21afd 100644
--- a/lib/libc/sys/getuid.2
+++ b/lib/libc/sys/getuid.2
@@ -88,4 +88,4 @@ function appeared in
 The
 .Fn geteuid
 function appeared in
-.At v7 .
+.At v4 .
diff --git a/lib/libc/sys/kill.2 b/lib/libc/sys/kill.2
index d5e55ca51ea0..c840cb819614 100644
--- a/lib/libc/sys/kill.2
+++ b/lib/libc/sys/kill.2
@@ -28,7 +28,7 @@
 .\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd March 15, 2012
+.Dd December 1, 2017
 .Dt KILL 2
 .Os
 .Sh NAME
@@ -150,7 +150,11 @@ The
 system call is expected to conform to
 .St -p1003.1-90 .
 .Sh HISTORY
-The
+A version of the
 .Fn kill
 function appeared in
-.At v7 .
+.At v3 .
+The signal number was added to the
+.Fn kill
+function in
+.At v4 .
diff --git a/lib/libc/sys/mknod.2 b/lib/libc/sys/mknod.2
index fe26f8103d4b..a673b816ae68 100644
--- a/lib/libc/sys/mknod.2
+++ b/lib/libc/sys/mknod.2
@@ -175,7 +175,7 @@ system call follows The Open Group Extended API Set 2 specification.
 The
 .Fn mknod
 function appeared in
-.At v6 .
+.At v4 .
 The
 .Fn mknodat
 system call appeared in
diff --git a/lib/libc/sys/pipe.2 b/lib/libc/sys/pipe.2
index b55c54d96345..0bfb8cf4ffb9 100644
--- a/lib/libc/sys/pipe.2
+++ b/lib/libc/sys/pipe.2
@@ -28,7 +28,7 @@
 .\"     @(#)pipe.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd July 20, 2016
+.Dd December 1, 2017
 .Dt PIPE 2
 .Os
 .Sh NAME
diff --git a/lib/libc/sys/profil.2 b/lib/libc/sys/profil.2
index b5c7ed4f2c7e..cdaa32a7f939 100644
--- a/lib/libc/sys/profil.2
+++ b/lib/libc/sys/profil.2
@@ -31,7 +31,7 @@
 .\"	@(#)profil.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd June 4, 1993
+.Dd December 1, 2017
 .Dt PROFIL 2
 .Os
 .Sh NAME
@@ -109,7 +109,7 @@ contains an invalid address.
 The
 .Fn profil
 function appeared in
-.At v7 .
+.At v6 .
 .Sh BUGS
 This routine should be named
 .Fn profile .
diff --git a/lib/libc/sys/ptrace.2 b/lib/libc/sys/ptrace.2
index d1dac69e641c..ed3d649253f7 100644
--- a/lib/libc/sys/ptrace.2
+++ b/lib/libc/sys/ptrace.2
@@ -2,7 +2,7 @@
 .\"	$NetBSD: ptrace.2,v 1.2 1995/02/27 12:35:37 cgd Exp $
 .\"
 .\" This file is in the public domain.
-.Dd September 14, 2017
+.Dd December 1, 2017
 .Dt PTRACE 2
 .Os
 .Sh NAME
@@ -1105,4 +1105,4 @@ holds the minimum buffer size required on return.
 The
 .Fn ptrace
 function appeared in
-.At v7 .
+.At v6 .
diff --git a/lib/libc/sys/setuid.2 b/lib/libc/sys/setuid.2
index 40e9719bfc62..691bc24976b3 100644
--- a/lib/libc/sys/setuid.2
+++ b/lib/libc/sys/setuid.2
@@ -158,7 +158,7 @@ function appeared in
 The
 .Fn setgid
 function appeared in
-.At v7 .
+.At v4 .
 .Sh SECURITY CONSIDERATIONS
 Read and write permissions to files are determined upon a call to
 .Xr open 2 .
diff --git a/lib/libc/sys/sync.2 b/lib/libc/sys/sync.2
index 068f77a634b2..9e806c3ef9e9 100644
--- a/lib/libc/sys/sync.2
+++ b/lib/libc/sys/sync.2
@@ -28,7 +28,7 @@
 .\"     @(#)sync.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd June 4, 1993
+.Dd December 1, 2017
 .Dt SYNC 2
 .Os
 .Sh NAME
@@ -69,7 +69,7 @@ attributes.
 The
 .Fn sync
 function appeared in
-.At v6 .
+.At v3 .
 .Sh BUGS
 The
 .Fn sync