D58321.id182423.diff
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	diff --git a/share/man/man9/exterror.9 b/share/man/man9/exterror.9
	--- a/share/man/man9/exterror.9
	+++ b/share/man/man9/exterror.9
	@@ -6,7 +6,7 @@
	.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
	.\" from the FreeBSD Foundation.
	.\"
	-.Dd November 5, 2025
	+.Dd July 21, 2026
	.Dt EXTERROR 9
	.Os
	.Sh NAME
	@@ -171,6 +171,17 @@
	in addition to the usual
	.Va errno
	decoding.
	+.Pp
	+Kernels built with the
	+.Cd option EXTERR_STRINGS
	+advertise the
	+.Va kern.features.exterr_strings
	+.Xr sysctl 8
	+variable, see
	+.Xr feature_present 3 ,
	+indicating that the reported errors include the descriptive message strings.
	+Without it, only the numeric information (error code, category,
	+source line number and parameters) is available.
	.Sh ASYNCHRONOUS INPUT/OUTPUT
	Due to the nature of the
	.Fx
	diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c
	--- a/sys/kern/sys_generic.c
	+++ b/sys/kern/sys_generic.c
	@@ -112,6 +112,10 @@
	static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
	MALLOC_DEFINE(M_IOV, "iov", "large iov's");

	+#ifdef EXTERR_STRINGS
	+FEATURE(exterr_strings, "Extended error reporting includes message strings");
	+#endif
	+
	static int pollout(struct thread , struct pollfd , struct pollfd *,
	u_int);
	static int pollscan(struct thread , struct pollfd , u_int);