diff --git a/man/journalctl.xml b/man/journalctl.xml
index 75427bc632..5bf895fce4 100644
--- a/man/journalctl.xml
+++ b/man/journalctl.xml
@@ -108,7 +108,10 @@
         <listitem><para>Show messages from system services and the kernel (with
         <option>--system</option>). Show messages from service of current user (with
         <option>--user</option>).  If neither is specified, show all messages that the user can see.
-        </para></listitem>
+        </para>
+
+        <para>The <option>--user</option> option affects how <option>--unit</option> arguments are
+        treated. See <option>--unit</option>.</para></listitem>
       </varlistentry>
 
       <varlistentry>
@@ -282,6 +285,9 @@
         <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
         unit, all logs of children of the slice will be shown.</para>
 
+        <para>With <option>--user</option>, all <option>--unit</option> arguments will be converted to match
+        user messages as if specified with <option>--user-unit</option>.</para>
+
         <para>This parameter can be specified multiple times.</para></listitem>
       </varlistentry>