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+<?xml version="1.0"?>
+<!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!--
+  SPDX-License-Identifier: LGPL-2.1+
+-->
+<refentry id="systemd-debug-generator">
+
+  <refentryinfo>
+    <title>systemd-debug-generator</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-debug-generator</refentrytitle>
+    <manvolnum>8</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-debug-generator</refname>
+    <refpurpose>Generator for enabling a runtime debug shell and
+    masking specific units at boot</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>/usr/lib/systemd/system-generators/systemd-debug-generator</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><filename>systemd-debug-generator</filename> is a generator
+    that reads the kernel command line and understands three
+    options:</para>
+
+    <para>If the <option>systemd.mask=</option> or <option>rd.systemd.mask=</option>
+    option is specified and followed by a unit name, this unit is
+    masked for the runtime, similar to the effect of
+    <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+    <command>mask</command> command. This is useful to boot with
+    certain units removed from the initial boot transaction for
+    debugging system startup. May be specified more than once.
+    <option>rd.systemd.mask=</option> is honored only by initial
+    RAM disk (initrd) while <option>systemd.mask=</option> is
+    honored only in the main system.</para>
+
+    <para>If the <option>systemd.wants=</option> or
+    <option>rd.systemd.wants=</option> option is specified
+    and followed by a unit name, a start job for this unit is added to
+    the initial transaction. This is useful to start one or more
+    additional units at boot. May be specified more than once.
+    <option>rd.systemd.wants=</option> is honored only by initial
+    RAM disk (initrd) while <option>systemd.wants=</option> is
+    honored only in the main system.</para>
+
+    <para>If the <option>systemd.debug_shell</option> or
+    <option>rd.systemd.debug_shell</option> option is
+    specified, the debug shell service
+    <literal>debug-shell.service</literal> is pulled into the boot
+    transaction. It will spawn a debug shell on tty9 during early
+    system startup. Note that the shell may also be turned on
+    persistently by enabling it with
+    <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+    <command>enable</command> command.
+    <option>rd.systemd.debug_shell=</option> is honored only by initial
+    RAM disk (initrd) while <option>systemd.debug_shell</option> is
+    honored only in the main system.</para>
+
+    <para><filename>systemd-debug-generator</filename> implements
+    <citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>