diff --git a/chapter08/systemd.xml b/chapter08/systemd.xml
index 6c844c603..fcac04602 100644
--- a/chapter08/systemd.xml
+++ b/chapter08/systemd.xml
@@ -223,7 +223,7 @@ meson --prefix=/usr                 \
         machinectl, networkctl, oomctl, portablectl, poweroff (symlink to
         systemctl), reboot (symlink to systemctl), resolvconf (symlink to
         resolvectl), resolvectl, runlevel (symlink to systemctl), shutdown
-        (symlink to systemctl), systemctl, systemd-analyze,
+        (symlink to systemctl), systemctl, systemd-ac-power, systemd-analyze,
         systemd-ask-password, systemd-cat, systemd-cgls, systemd-cgtop,
         systemd-creds, systemd-delta, systemd-detect-virt,
         systemd-dissect, systemd-escape, systemd-hwdb, systemd-id128,
@@ -476,6 +476,17 @@ meson --prefix=/usr                 \
         </listitem>
       </varlistentry>
 
+      <varlistentry id="systemd-ac-power">
+        <term><command>systemd-ac-power</command></term>
+        <listitem>
+          <para>Reports whether the system is connected to an external
+          power source.</para>
+          <indexterm zone="ch-system-systemd systemd-ac-power">
+            <primary sortas="b-systemd-ac-power">systemd-ac-power</primary>
+          </indexterm>
+        </listitem>
+      </varlistentry>
+
       <varlistentry id="systemd-analyze">
         <term><command>systemd-analyze</command></term>
         <listitem>