Index: x/installing/tuning-fontconfig.xml
===================================================================
--- x/installing/tuning-fontconfig.xml	(revision f072b06fbe5642b488ea1e34ef7a2b955c74a492)
+++ x/installing/tuning-fontconfig.xml	(revision dcc1b9262f947613edcee8eb1e94215647a67545)
@@ -75,4 +75,7 @@
       <listitem>
         <para><xref linkend="editing-old-style-conf-files"/></para>
+      </listitem>
+      <listitem>
+        <para><xref linkend="items-which-can-override-fontconfig"/></para>
       </listitem>
       <listitem>
@@ -402,6 +405,7 @@
       To try out different settings, you may need to exit from Xorg and then
       run <command>startx</command> again so that all applications use the new
-      settings. If you use GNOME, KDE, or LXQt, their desktops can override
-      these changes. To explore the possibilities, create a file for your user:
+      settings. Several things can override the fontconfig settings, see
+      <xref linkend="items-which-can-override-fontconfig"/> below. To explore
+      the possibilities, create a file for your user:
     </para>
 
@@ -865,6 +869,69 @@
     </para>
 
+    <bridgehead renderas="sect3" id="items-which-can-override-fontconfig"
+    xreflabel="Items which can override fontconfig">Items which can override fontconfig</bridgehead>
+
+    <para>
+      Several desktop environments, as well as some programs, will use fontconfig
+      to find fonts but may override certain things.
+    </para>
+
+    <para>
+      GNOME: The settings in org.gnome.desktop.interface can be updated with
+      <application>dconf-editor</application>. You can set the fonts to your preference
+      and desired point size. To use the fonts chosen by fontconfig specify e.g.
+      'Sans 12', Serif 11', 'Mono 10' as desired. Also review the antialiasing, hinting
+      and rgba settings.
+    </para>
+
+    <para>
+      LXQt: Change font settings as necessary to match fontconfig in
+      <application>lxqt-config-appearance</application>.
+    </para>
+
+    <para>
+      KDE Plasma: The settings can be adjusted in <application>System
+      Settings</application> under Appearance -> Fonts. This will create or modify
+      <filename>~/.config/fontconfig/fonts.conf</filename> although
+      <filename>~/.config/fontconfig/fonts.conf</filename>, if installed, can
+      override that.
+    </para>
+
+    <para>
+      Xfce desktop: The settings can be adjusted in
+      <application>Settings</application> Appearance -> Fonts. Specify your
+      preferred fonts, e.g. 'Sans Regular' (to use the regular face and weight
+      rather than Bold and/or Italic) and adjust the point size in the option.
+      Review the Rendering and DPI options.
+    </para>
+
+    <para>
+      Firefox: This browser allows you to specify its default fonts. For the 115esr
+      series, use the 'Hamburger' menu to got to Preferences, General, and under Fonts
+      -> Advanced select Sans Serif, Serif, Monospace as appropriate if you wish to use
+      the fonts which match fontconfig.  Set the point sizes as desired. In later
+      versions, the settings are at Preferences -> Fonts.
+      <!-- FIXME : Ken - when merging, add note in packages to update this when next ESR
+      series is used --> 
+    </para>
+
+    <para>
+      Libreoffice: Tests using English text with an old Japanese font (HanaMinA)
+      which supports several European languages but had only one weight and no
+      italics or slant showed that although <application>Libreoffice</application>
+      uses fontconfig to find the font, it created its own bold or slanted text.
+      It is not clear if it will do the same where a font actually has bold weight
+      or an italic face. Also, documentation shows that Libreoffice has its own
+      substitution rules for when a codepoint is not found in the selected font,
+      but is unclear if those rules apply on Linux using fontconfig.
+    </para>
+
+    <para>
+      Pango: as noted in the example <filename>~/.config/fontconfig</filename>
+      above, anything using Pango-1.44 (from 2019) or later now uses Harfbuzz for
+      hinting, not FreeType, and <literal>hintfull</literal> is not supported.
+    </para>
+
   </sect2>
-
 
   <sect2 role="configuration" id="see-also" xreflabel="See Also">
