diff --git a/en_US.ISO8859-1/books/handbook/boot/chapter.xml b/en_US.ISO8859-1/books/handbook/boot/chapter.xml
index 94e183d5a0..8ae9da9e3a 100644
--- a/en_US.ISO8859-1/books/handbook/boot/chapter.xml
+++ b/en_US.ISO8859-1/books/handbook/boot/chapter.xml
@@ -895,6 +895,9 @@ bitmap_name="/boot/<replaceable>splash.bin</replaceable>"</programlisting>
       &man.reboot.8;.  Refer to their manual pages and to
       &man.shutdown.8; for more information.</para>
 
+      <para>Modify group membership by referring to
+	<xref linkend="users-synopsis"/>.</para>
+
     <note>
       <para>Power management requires &man.acpi.4; to be loaded as
 	a module or statically compiled into a custom kernel.</para>