diff --git a/nixos/doc/manual/release-notes/rl-2411.section.md b/nixos/doc/manual/release-notes/rl-2411.section.md
index 3815475f9f70..8fdee36e2260 100644
--- a/nixos/doc/manual/release-notes/rl-2411.section.md
+++ b/nixos/doc/manual/release-notes/rl-2411.section.md
@@ -701,6 +701,8 @@
 
 - The arguments from [](#opt-services.postgresql.initdbArgs) now get shell-escaped.
 
+- Mattermost has been updated from 9.5 to 9.11 ESR. See the [changelog](https://docs.mattermost.com/about/mattermost-v9-changelog.html#release-v9-11-extended-support-release) for more details.
+
 - `cargo-tauri.hook` was introduced to help users build [Tauri](https://tauri.app/) projects. It is meant to be used alongside
   `rustPlatform.buildRustPackage` and Node hooks such as `npmConfigHook`, `pnpm.configHook`, and the new `yarnConfig`