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	Index: head/share/man/man9/pmap_enter.9
	===================================================================
	--- head/share/man/man9/pmap_enter.9
	+++ head/share/man/man9/pmap_enter.9
	@@ -26,7 +26,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd February 16, 2018
	+.Dd December 16, 2018
	.Dt PMAP_ENTER 9
	.Os
	.Sh NAME
	@@ -119,6 +119,14 @@
	for destroyed mappings if the implementation can ensure
	that no other writeable managed mappings for the previously
	mapped pages exist.
	+.Pp
	+If the request modifies an existing mapping to use a different physical
	+page, an implementation of
	+.Nm
	+must invalidate the previous mapping before installing the new one.
	+This ensures that all threads sharing the pmap keep a consistent
	+view of the mapping, which is necessary for the correct handling
	+of CoW (copy on write) faults.
	.Pp
	If the page
	.Fa m