diff --git a/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
index 2d8086aba774..6f1059bba304 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
@@ -32,10 +32,14 @@
       </listitem>
       <listitem>
         <para>
-          Mattermost has been updated to version 6.2. Migrations may
-          take a while, see the
-          <link xlink:href="https://docs.mattermost.com/install/self-managed-changelog.html#release-v6.2-feature-release">upgrade
-          notes</link>.
+          Mattermost has been updated to extended support release 6.3,
+          as the previously packaged extended support release 5.37 is
+          <link xlink:href="https://docs.mattermost.com/upgrade/extended-support-release.html">reaching
+          its end of life</link>. Migrations may take a while, see the
+          <link xlink:href="https://docs.mattermost.com/install/self-managed-changelog.html#release-v6-3-extended-support-release">changelog</link>
+          and
+          <link xlink:href="https://docs.mattermost.com/upgrade/important-upgrade-notes.html">important
+          upgrade notes</link>.
         </para>
       </listitem>
     </itemizedlist>
@@ -517,6 +521,13 @@
           <literal>programs.starship.settings</literal>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <literal>services.mattermost.plugins</literal> has been added
+          to allow the declarative installation of Mattermost plugins.
+          Plugins are automatically repackaged using autoPatchelf.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>
diff --git a/nixos/doc/manual/release-notes/rl-2205.section.md b/nixos/doc/manual/release-notes/rl-2205.section.md
index f83573a3a860..7dbaf4157e56 100644
--- a/nixos/doc/manual/release-notes/rl-2205.section.md
+++ b/nixos/doc/manual/release-notes/rl-2205.section.md
@@ -13,8 +13,9 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - PHP 8.1 is now available
 
-- Mattermost has been updated to version 6.2. Migrations may take a while,
-  see the [upgrade notes](https://docs.mattermost.com/install/self-managed-changelog.html#release-v6.2-feature-release).
+- Mattermost has been updated to extended support release 6.3, as the previously packaged extended support release 5.37 is [reaching its end of life](https://docs.mattermost.com/upgrade/extended-support-release.html).
+  Migrations may take a while, see the [changelog](https://docs.mattermost.com/install/self-managed-changelog.html#release-v6-3-extended-support-release)
+  and [important upgrade notes](https://docs.mattermost.com/upgrade/important-upgrade-notes.html).
 
 ## New Services {#sec-release-22.05-new-services}
 
@@ -177,3 +178,6 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - A new module was added for the [Starship](https://starship.rs/) shell prompt,
   providing the options `programs.starship.enable` and `programs.starship.settings`.
+
+- `services.mattermost.plugins` has been added to allow the declarative installation of Mattermost plugins.
+  Plugins are automatically repackaged using autoPatchelf.
diff --git a/nixos/modules/services/web-apps/mattermost.nix b/nixos/modules/services/web-apps/mattermost.nix
index 310a673f5114..2901f307dc5a 100644
--- a/nixos/modules/services/web-apps/mattermost.nix
+++ b/nixos/modules/services/web-apps/mattermost.nix
@@ -181,7 +181,7 @@ in
         description = ''
           Plugins to add to the configuration. Overrides any installed if non-null.
           This is a list of paths to .tar.gz files or derivations evaluating to
-          .tar.gz files. All entries will be passed to `mattermost plugin add`.
+          .tar.gz files.
         '';
       };