issues.dbk: document mutt vs neomutt

Thanks to Antonio Radici and Justin B Rye
Closes: #928353

en/issues.dbk

@@ -522,6 +522,27 @@ $ sudo update-initramfs -u
     </para>
   </section>
 
+  <section id="mutt-and-neomutt">
+    <!-- stretch to buster -->
+    <title>mutt and neomutt</title>
+    <para>
+      In stretch, the package <systemitem role="package">mutt</systemitem>
+      had patches applied from the sources at <ulink
+      url="https://www.neomutt.org">https://www.neomutt.org</ulink>. Starting
+      from buster, the package providing <literal>/usr/bin/mutt</literal> will
+      instead be purely based on the original sources from <ulink
+      url="https://www.mutt.org">https://www.mutt.org</ulink>, and a separate
+      <systemitem role="package">neomutt</systemitem> package is available
+      providing <literal>/usr/bin/neomutt</literal>.
+    </para>
+    <para>
+      This means that some of the features that were previously provided by
+      <systemitem role="package">mutt</systemitem> are no longer available. If
+      this breaks your configuration you can install <systemitem
+      role="package">neomutt</systemitem> instead.
+    </para>
+  </section>
+
 </section>
 
 </chapter>