D52820.id163446.diff
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	diff --git a/share/man/man7/arch.7 b/share/man/man7/arch.7
	--- a/share/man/man7/arch.7
	+++ b/share/man/man7/arch.7
	@@ -340,13 +340,33 @@
	.Ed
	.Pp
	Common type size and endianness macros:
	-.Bl -column -offset indent "BYTE_ORDER" "Meaning"
	+.Bl -column -offset indent "__SIZEOF_POINTER__" "Meaning"
	.It Sy Macro Ta Sy Meaning
	+.It Dv __SIZEOF_LONG__ Ta size in bytes of long
	+.It Dv __SIZEOF_POINTER__ Ta size in bytes of intptr_t and pointer
	+.It Dv __SIZEOF_SIZE_T__ Ta size in bytes of size_t
	.It Dv __LP64__ Ta 64-bit (8-byte) long and pointer, 32-bit (4-byte) int
	.It Dv __ILP32__ Ta 32-bit (4-byte) int, long and pointer
	.It Dv BYTE_ORDER Ta Either Dv BIG_ENDIAN or Dv LITTLE_ENDIAN .
	.El
	.Pp
	+Because systems were historically either
	+.Dv __ILP32__
	+or
	+.Dv __LP64__
	+it has been common for programmers to test of one and assume the other
	+one in an else branch.
	+With the arrival of CHERI architectures, this is no longer the case and
	+.Dv __SIZEOF_*__
	+macros should be used for machine independent code and care should be
	+taken when introducing new uses of
	+.Dv __ILP32__
	+or
	+.Dv __LP64__ .
	+Compilers for CHERI targets do not define
	+.Dv __LP64__
	+as their pointers are 128-bit capabilities.
	+.Pp
	Architecture-specific macros:
	.Bl -column -offset indent "Architecture" "Predefined macros"
	.It Sy Architecture Ta Sy Predefined macros