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D35139.diff
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diff --git a/sbin/dmesg/dmesg.8 b/sbin/dmesg/dmesg.8
--- a/sbin/dmesg/dmesg.8
+++ b/sbin/dmesg/dmesg.8
@@ -28,7 +28,7 @@
.\" @(#)dmesg.8 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
-.Dd May 6, 2022
+.Dd May 7, 2022
.Dt DMESG 8
.Os
.Sh NAME
@@ -73,8 +73,7 @@
.Sh SYSCTL VARIABLES
The following
.Xr sysctl 8
-variables can be used to control the behavior of the kernel's placing data into
-the message buffer:
+variables control how the kernel timestamps entries in the message buffer:
The default value is shown next to each variable.
.Bl -tag -width indent
.It kern.msgbuf_show_timestamp : No 0
@@ -85,6 +84,8 @@
This may also be set as a boot
.Xr loader 8
tunable.
+The timestamps are placed at the start of most lines that the kernel generates.
+Some multi-line messages will have only the first line tagged with a timestamp.
.El
.Sh FILES
.Bl -tag -width ".Pa /var/run/dmesg.boot" -compact
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D35139: dmesg: Document kern.msgbuf_show_timestamp
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