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diff --git a/lib/libc/sys/copy_file_range.2 b/lib/libc/sys/copy_file_range.2
--- a/lib/libc/sys/copy_file_range.2
+++ b/lib/libc/sys/copy_file_range.2
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd March 30, 2020
+.Dd January 2, 2021
.Dt COPY_FILE_RANGE 2
.Os
.Sh NAME
@@ -117,6 +117,15 @@
.Dv SEEK_DATA
arguments and this system call for the
data ranges found.
+.Pp
+For best performance, call
+.Fn copy_file_range
+with the largest
+.Fa len
+value possible.
+It is interruptible on most file systems,
+so there is no penalty for using very large len values, even SSIZE_MAX.
+.Pp
.Sh RETURN VALUES
If it succeeds, the call returns the number of bytes copied, which can be fewer
than

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