+ <term><option>-b <optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
+ <term><option>--boot=<optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
+
+ <listitem><para>Show messages from a specific
+ boot. This will add a match for
+ <literal>_BOOT_ID=</literal>.</para>
+
+ <para>The argument may be empty, in which case
+ logs for the current boot will be shown.</para>
+
+ <para>If the boot ID is omitted, a positive
+ <replaceable>offset</replaceable> will look up
+ the boots starting from the beginning of the
+ journal, and a equal-or-less-than zero
+ <replaceable>offset</replaceable> will look up
+ boots starting from the end of the
+ journal. Thus, <constant>1</constant> means the
+ first boot found in the journal in
+ chronological order, <constant>2</constant> the
+ second and so on; while <constant>-0</constant>
+ is the last boot, <constant>-1</constant> the
+ boot before last, and so on. An empty
+ <replaceable>offset</replaceable> is equivalent
+ to specifying <constant>-0</constant>, except
+ when the current boot is not the last boot
+ (e.g. because <option>--directory</option> was
+ specified to look at logs from a different
+ machine).</para>
+
+ <para>If the 32-character
+ <replaceable>ID</replaceable> is specified, it
+ may optionally be followed by
+ <replaceable>offset</replaceable> which
+ identifies the boot relative to the one given by
+ boot <replaceable>ID</replaceable>. Negative
+ values mean earlier boots and a positive values
+ mean later boots. If
+ <replaceable>offset</replaceable> is not
+ specified, a value of zero is assumed, and the
+ logs for the boot given by
+ <replaceable>ID</replaceable> are shown.
+ </para>
+
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--list-boots</option></term>
+
+ <listitem><para>Show a tabular list of
+ boot numbers (relative to the current
+ boot), their IDs, and the timestamps
+ of the first and last message
+ pertaining to the boot.
+ </para></listitem>
+ </varlistentry>