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diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index 950558feec..cb0605bcd1 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -644,6 +644,49 @@
of the container OS itself.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>--volatile</option><replaceable>=MODE</replaceable></term>
+
+ <listitem><para>Boots the container in
+ volatile (ephemeral) mode. When no
+ mode parameter is passed or when mode
+ is specified as <literal>yes</literal>
+ full volatile mode is enabled. This
+ means the root directory is mounted as
+ mostly unpopulated
+ <literal>tmpfs</literal> instance, and
+ <filename>/usr</filename> from the OS
+ tree is mounted into it, read-only
+ (the system thus starts up with
+ read-only OS resources, but pristine
+ state and configuration, any changes
+ to the either are lost on
+ shutdown). When the mode parameter is
+ specified as <literal>state</literal>
+ the OS tree is mounted read-only, but
+ <filename>/var</filename> is mounted
+ as <literal>tmpfs</literal> instance
+ into it (the system thus starts up
+ with read-only OS resources and
+ configuration, but prestine state, any
+ changes to the latter are lost on
+ shutdown). When the mode parameter is
+ specified as <literal>no</literal>
+ (the default) the whole OS tree is made
+ available writable.</para>
+
+ <para>Note that setting this to
+ <literal>yes</literal> or
+ <literal>state</literal> will only
+ work correctly with operating systems
+ in the container that can boot up with
+ only <filename>/usr</filename>
+ mounted, and are able to populate
+ <filename>/var</filename>
+ automatically, as
+ needed.</para></listitem>
+ </varlistentry>
+
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>