Index: head/lib/libc/sys/mmap.2
===================================================================
--- head/lib/libc/sys/mmap.2
+++ head/lib/libc/sys/mmap.2
@@ -542,3 +542,16 @@
 .Xr munmap 2 ,
 .Xr getpagesize 3 ,
 .Xr getpagesizes 3
+.Sh HISTORY
+The
+.Nm
+system call was first documented in
+.Bx 4.2
+and implemented in
+.Bx 4.4 .
+.\" XXX: lots of missing history of FreeBSD additions.
+.Pp
+The
+.Dv PROT_MAX
+functionality was introduced in
+.Fx 13 .
Index: head/lib/libc/sys/mprotect.2
===================================================================
--- head/lib/libc/sys/mprotect.2
+++ head/lib/libc/sys/mprotect.2
@@ -118,5 +118,12 @@
 .Sh HISTORY
 The
 .Fn mprotect
-system call first appeared in
+system call was first documented in
+.Bx 4.2
+and first appeared in
 .Bx 4.4 .
+.Pp
+The
+.Dv PROT_MAX
+functionality was introduced in
+.Fx 13 .