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	Index: head/lib/libc/string/strerror.3
	===================================================================
	--- head/lib/libc/string/strerror.3
	+++ head/lib/libc/string/strerror.3
	@@ -32,7 +32,7 @@
	.\" @(#)strerror.3 8.1 (Berkeley) 6/9/93
	.\" $FreeBSD$
	.\"
	-.Dd December 7, 2020
	+.Dd December 17, 2020
	.Dt STRERROR 3
	.Os
	.Sh NAME
	@@ -170,6 +170,31 @@
	or
	.Fn strerror_r
	should be used instead.
	+.Sh EXAMPLES
	+The following example shows how to use
	+.Fn perror
	+to report an error.
	+.Bd -literal -offset 2n
	+#include <fcntl.h>
	+#include <stdio.h>
	+#include <stdlib.h>
	+
	+int
	+main(void)
	+{
	+ int fd;
	+
	+ if ((fd = open("/nonexistent", O_RDONLY)) == -1) {
	+ perror("open()");
	+ exit(1);
	+ }
	+ printf("File descriptor: %d\en", fd);
	+ return (0);
	+}
	+.Ed
	+.Pp
	+When executed, the program will print an error message along the lines of
	+.Ql "open(): No such file or directory" .
	.Sh SEE ALSO
	.Xr intro 2 ,
	.Xr err 3 ,