Index: head/share/man/man3/sigevent.3
===================================================================
--- head/share/man/man3/sigevent.3
+++ head/share/man/man3/sigevent.3
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 15, 2016
+.Dd February 25, 2020
 .Dt SIGEVENT 3
 .Os
 .Sh NAME
@@ -119,6 +119,11 @@
 .Xr mq_notify 2 ,
 .Xr timer_create 2 ,
 .Xr siginfo 3
+.Sh HISTORY
+The
+.Va sigevent
+structure first appeared in
+.Fx 3.3 .
 .Sh STANDARDS
 The
 .Vt struct sigevent
Index: head/share/man/man3/stdarg.3
===================================================================
--- head/share/man/man3/stdarg.3
+++ head/share/man/man3/stdarg.3
@@ -32,7 +32,7 @@
 .\"	@(#)stdarg.3	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd October 25, 2002
+.Dd February 25, 2020
 .Dt STDARG 3
 .Os
 .Sh NAME
@@ -216,6 +216,18 @@
 and
 .Fn va_end
 macros conform to
+.St -isoC-99 .
+.Sh HISTORY
+The
+.Fn va_start ,
+.Fn va_arg
+and
+.Fn va_end
+macros were introduced in
+.St -ansiC .
+The
+.Fn va_copy
+macro was introduced in
 .St -isoC-99 .
 .Sh BUGS
 Unlike the
Index: head/share/man/man3/tree.3
===================================================================
--- head/share/man/man3/tree.3
+++ head/share/man/man3/tree.3
@@ -30,7 +30,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 28, 2019
+.Dd February 25, 2020
 .Dt TREE 3
 .Os
 .Sh NAME
@@ -697,6 +697,9 @@
 .Sh SEE ALSO
 .Xr arb 3 ,
 .Xr queue 3
+.Sh HISTORY
+The tree macros first appeared in
+.Fx 4.6 .
 .Sh AUTHORS
 The author of the tree macros is
 .An Niels Provos .