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-rw-r--r--man/timedatectl.xml27
1 files changed, 21 insertions, 6 deletions
diff --git a/man/timedatectl.xml b/man/timedatectl.xml
index 2d42b41d5e..9a86c4126a 100644
--- a/man/timedatectl.xml
+++ b/man/timedatectl.xml
@@ -166,12 +166,27 @@
<term><command>set-ntp [BOOL]</command></term>
<listitem><para>Takes a boolean argument. Controls whether
- network time synchronization is enabled (if available). This
- enables or disables the
- <filename>systemd-timesyncd.service</filename> unit. Note that
- even if this command turns time synchronization off a
- different system service might still synchronize the clock
- with the network.</para></listitem>
+ network time synchronization is active and enabled (if
+ available). This enables and starts, or disables and stops the
+ <filename>systemd-timesyncd.service</filename> unit. It does
+ not affect the state of any other, unrelated network time
+ synchronization services that might be installed on the
+ system. This command is hence mostly equivalent to:
+ <command>systemctl enable --now
+ systemd-timesyncd.service</command> and <command>systemctl
+ disable --now systemd-timesyncd.service</command>, but is
+ protected by a different access policy.</para>
+
+ <para>Note that even if time synchronization is turned off
+ with this command another, unrelated system service might
+ still synchronize the clock with the network. Also note that
+ strictly speaking
+ <filename>systemd-timesyncd.service</filename> does more than
+ just network time synchronization as it ensures a monotonic
+ clock on systems without RTC even if no network is
+ available. See
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ for details about this.</para></listitem>
</varlistentry>
</variablelist>