diff --git a/man/journalctl.xml b/man/journalctl.xml
index 37fb0d67fd..39c8c07d6b 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -752,7 +752,7 @@
         <term><option>--vacuum-time=</option></term>
         <term><option>--vacuum-files=</option></term>
 
-        <listitem><para>Removes archived journal files until the disk
+        <listitem><para>Removes the oldest archived journal files until the disk
         space they use falls below the specified size (specified with
         the usual <literal>K</literal>, <literal>M</literal>,
         <literal>G</literal> and <literal>T</literal> suffixes), or all
diff --git a/man/systemd-journald.service.xml b/man/systemd-journald.service.xml
index dfff107e1f..d78aef3a63 100644
--- a/man/systemd-journald.service.xml
+++ b/man/systemd-journald.service.xml
@@ -296,7 +296,12 @@ systemd-tmpfiles --create --prefix /var/log/journal</programlisting>
         and the functions in the
         <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
         library should be able to read all entries that have been fully written.</para>
-        </listitem>
+
+        <para><filename>systemd-journald</filename> will automatically remove the oldest
+        archived journal files to limit disk use. See <varname>SystemMaxUse=</varname>
+        and related settings in
+        <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+        </para></listitem>
       </varlistentry>
 
       <varlistentry>