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+<?xml version="1.0"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+                 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
+
+<!--
+  SPDX-License-Identifier: LGPL-2.1+
+-->
+
+<refsect1>
+  <title>Environment</title>
+
+  <variablelist class='environment-variables'>
+    <varlistentry id='pager'>
+      <term><varname>$SYSTEMD_PAGER</varname></term>
+
+      <listitem><para>Pager to use when <option>--no-pager</option> is not given; overrides
+      <varname>$PAGER</varname>. If neither <varname>$SYSTEMD_PAGER</varname> nor <varname>$PAGER</varname> are set, a
+      set of well-known pager implementations are tried in turn, including
+      <citerefentry project='man-pages'><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> and
+      <citerefentry project='man-pages'><refentrytitle>more</refentrytitle><manvolnum>1</manvolnum></citerefentry>, until one is found. If
+      no pager implementation is discovered no pager is invoked. Setting this environment variable to an empty string
+      or the value <literal>cat</literal> is equivalent to passing <option>--no-pager</option>.</para></listitem>
+    </varlistentry>
+
+    <varlistentry id='less'>
+      <term><varname>$SYSTEMD_LESS</varname></term>
+
+      <listitem><para>Override the options passed to <command>less</command> (by default
+      <literal>FRSXMK</literal>).</para>
+
+      <para>If the value of <varname>$SYSTEMD_LESS</varname> does not include <literal>K</literal>,
+      and the pager that is invoked is <command>less</command>,
+      <keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> will be ignored by the
+      executable.  This allows <command>less</command> to handle
+      <keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> itself.</para></listitem>
+    </varlistentry>
+
+    <varlistentry id='lesscharset'>
+      <term><varname>$SYSTEMD_LESSCHARSET</varname></term>
+
+      <listitem><para>Override the charset passed to <command>less</command> (by default <literal>utf-8</literal>, if
+      the invoking terminal is determined to be UTF-8 compatible).</para></listitem>
+    </varlistentry>
+
+    </variablelist>
+</refsect1>