D31777.diff
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	diff --git a/lib/libc/sys/mprotect.2 b/lib/libc/sys/mprotect.2
	--- a/lib/libc/sys/mprotect.2
	+++ b/lib/libc/sys/mprotect.2
	@@ -28,7 +28,7 @@
	.\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93
	.\" $FreeBSD$
	.\"
	-.Dd September 3, 2021
	+.Dd September 7, 2021
	.Dt MPROTECT 2
	.Os
	.Sh NAME
	@@ -47,12 +47,16 @@
	changes the specified pages to have protection
	.Fa prot .
	.Pp
	-Currently these protection bits are known,
	-which can be combined, OR'd together:
	+The
	+.Fa prot
	+argument shall be
	+.Dv PROT_NONE
	+(no permissions at all)
	+or the bitwise
	+.Em or
	+of one or more of the following values:
	.Pp
	.Bl -tag -width ".Dv PROT_WRITE" -compact
	-.It Dv PROT_NONE
	-No permissions at all.
	.It Dv PROT_READ
	The pages can be read.
	.It Dv PROT_WRITE
	@@ -61,13 +65,16 @@
	The pages can be executed.
	.El
	.Pp
	-In addition to these protection flags,
	+In addition to these standard protection flags,
	+the
	.Fx
	+implementation of
	+.Fn mprotect
	provides the ability to set the maximum protection of a region
	(which prevents
	.Nm
	-from upgrading the permissions).
	-This is accomplished by
	+from adding to the permissions later).
	+This is accomplished by bitwise
	.Em or Ns 'ing
	one or more
	.Dv PROT_