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diff --git a/doc/manual/command-ref/nix-collect-garbage.xml b/doc/manual/command-ref/nix-collect-garbage.xml
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--- a/doc/manual/command-ref/nix-collect-garbage.xml
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@@ -1,63 +0,0 @@
-<refentry xmlns="http://docbook.org/ns/docbook"
-      xmlns:xlink="http://www.w3.org/1999/xlink"
-      xmlns:xi="http://www.w3.org/2001/XInclude"
-      version="5.0"
-      xml:id="sec-nix-collect-garbage">
-  
-<refmeta>
-  <refentrytitle>nix-collect-garbage</refentrytitle>
-  <manvolnum>1</manvolnum>
-  <refmiscinfo class="source">Nix</refmiscinfo>
-  <refmiscinfo class="version"><xi:include href="../version.txt" parse="text"/></refmiscinfo>
-</refmeta>
-
-<refnamediv>
-  <refname>nix-collect-garbage</refname>
-  <refpurpose>delete unreachable store paths</refpurpose>
-</refnamediv>
-
-<refsynopsisdiv>
-  <cmdsynopsis>
-    <command>nix-collect-garbage</command>
-    <arg><option>--delete-old</option></arg>
-    <arg><option>-d</option></arg>
-    <arg><option>--delete-older-than</option> <emphasis>period</emphasis></arg>
-    <arg><option>--max-freed</option> <emphasis>bytes</emphasis></arg>
-    <arg><option>--dry-run</option></arg>
-  </cmdsynopsis>
-</refsynopsisdiv>
-
-<refsection><title>Description</title>
-
-<para>The command <command>nix-collect-garbage</command> is mostly an
-alias of <link linkend="rsec-nix-store-gc"><command>nix-store
---gc</command></link>, that is, it deletes all unreachable paths in
-the Nix store to clean up your system.  However, it provides two
-additional options: <option>-d</option> (<option>--delete-old</option>),
-which deletes all old generations of all profiles in
-<filename>/nix/var/nix/profiles</filename> by invoking
-<literal>nix-env --delete-generations old</literal> on all profiles
-(of course, this makes rollbacks to previous configurations
-impossible); and
-<option>--delete-older-than</option> <emphasis>period</emphasis>,
-where period is a value such as <literal>30d</literal>, which deletes
-all generations older than the specified number of days in all profiles
-in <filename>/nix/var/nix/profiles</filename> (except for the generations
-that were active at that point in time).
-</para>
-
-</refsection>
-
-<refsection><title>Example</title>
-
-<para>To delete from the Nix store everything that is not used by the
-current generations of each profile, do
-
-<screen>
-$ nix-collect-garbage -d</screen>
-
-</para>
-
-</refsection>
-
-</refentry>