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-rw-r--r--man/sd_notify.xml18
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diff --git a/man/sd_notify.xml b/man/sd_notify.xml
index 9d55ca4f8c..6a689555dd 100644
--- a/man/sd_notify.xml
+++ b/man/sd_notify.xml
@@ -228,6 +228,24 @@
</refsect1>
<refsect1>
+ <title>Environment</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><varname>$NOTIFY_SOCKET</varname></term>
+
+ <listitem><para>Set by the init system
+ for supervised processes for status
+ and start-up completion
+ notification. This environment variable
+ specifies the socket
+ <function>sd_notify()</function> talks
+ to. See above for details.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
<title>Examples</title>
<example>