--- a/doc/man/pam_xauth_data.3.xml	2021-11-01 12:04:45.640077994 +0100
+++ b/doc/man/pam_xauth_data.3.xml	2019-09-24 13:06:13.531781973 +0200
@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+                   "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
+
+<refentry id="pam_xauth_data">
+
+  <refmeta>
+    <refentrytitle>pam_xauth_data</refentrytitle>
+    <manvolnum>3</manvolnum>
+    <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo>
+  </refmeta>
+
+  <refnamediv id="pam_xauth_data-name">
+    <refname>pam_xauth_data</refname>
+    <refpurpose>structure containing X authentication data</refpurpose>
+  </refnamediv>
+
+<!-- body begins here -->
+
+  <refsynopsisdiv>
+    <funcsynopsis id="pam_xauth_data-synopsis">
+      <funcsynopsisinfo>#include &lt;security/pam_appl.h&gt;</funcsynopsisinfo>
+    </funcsynopsis>
+    <programlisting>
+struct pam_xauth_data {
+    int namelen;
+    char *name;
+    int datalen;
+    char *data;
+};
+    </programlisting>
+  </refsynopsisdiv>
+
+  <refsect1 id='pam_xauth_data-description'>
+    <title>DESCRIPTION</title>
+    <para>
+      The <function>pam_xauth_data</function> structure contains X
+      authentication data used to make a connection to an X display.
+      Using this mechanism, an application can communicate X
+      authentication data to PAM service modules.  This allows modules to
+      make a connection to the user's X display in order to label the
+      user's session on login, display visual feedback or for other
+      purposes.
+    </para>
+    <para>
+      The <emphasis>name</emphasis> field contains the name of the
+      authentication method, such as "MIT-MAGIC-COOKIE-1".  The
+      <emphasis>namelen</emphasis> field contains the length of this string,
+      not including the trailing NUL character.
+    </para>
+    <para>
+      The <emphasis>data</emphasis> field contains the authentication
+      method-specific data corresponding to the specified name.  The
+      <emphasis>datalen</emphasis> field contains its length in bytes.
+    </para>
+    <para>
+      The X authentication data can be changed with the
+      <emphasis>PAM_XAUTH_DATA</emphasis> item. It can be queried and
+      set with
+      <citerefentry>
+        <refentrytitle>pam_get_item</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>
+      and
+      <citerefentry>
+        <refentrytitle>pam_set_item </refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>  respectively.  The value used to set it should be
+      a pointer to a pam_xauth_data structure.  An internal copy of both
+      the structure itself and its fields is made by PAM when setting the
+      item.
+    </para>
+  </refsect1>
+
+  <refsect1 id='pam_xauth_data-see_also'>
+    <title>SEE ALSO</title>
+    <para>
+      <citerefentry>
+        <refentrytitle>pam_start</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+        <refentrytitle>pam_get_item</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry>,
+    </para>
+  </refsect1>
+
+  <refsect1 id='pam_xauth_data-standards'>
+    <title>STANDARDS</title>
+    <para>
+      The <function>pam_xauth_data</function> structure and
+      <emphasis>PAM_XAUTH_DATA</emphasis> item are
+      Linux-PAM extensions.
+    </para>
+  </refsect1>
+
+</refentry>