man: document the WATCHDOG_USEC environment variable

diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 0b5edb85603059229364f9f8dc4d00af9900c41d..a1d8a523ef25f25ececb73a2334e8309b25bf37c 100644 (file)
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -461,20 +461,26 @@
 
                         <varlistentry>
                                 <term><varname>WatchdogSec=</varname></term>
-                                <listitem><para>Configures the watchdog
-                                timeout for a service. This is activated
-                                when the start-up is completed. The service
-                                must call
+                                <listitem><para>Configures the
+                                watchdog timeout for a service. This
+                                is activated when the start-up is
+                                completed. The service must call
                                 <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
-                                regularly with "WATCHDOG=1". If the time
-                                between two such calls is larger than
-                                the configured time then the service
-                                enters a failure state. By setting
+                                regularly with "WATCHDOG=1". If the
+                                time between two such calls is larger
+                                than the configured time then the
+                                service is placed in a failure
+                                state. By setting
                                 <term><varname>Restart=</varname></term>
                                 to <option>on-failure</option> or
-                                <option>always</option> the service can
-                                be restarted. Defaults to 0s, which
-                                disables this feature.</para></listitem>
+                                <option>always</option> the service
+                                will be automatically restarted. The
+                                time configured here will be passed to
+                                the executed service process in the
+                                <varname>WATCHDOG_USEC=</varname>
+                                environment variable. Defaults to 0s,
+                                which disables this
+                                feature.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>