diff --git a/docs/release-notes/index.md b/docs/release-notes/index.md
index 983c06620f..186f0e3806 100644
--- a/docs/release-notes/index.md
+++ b/docs/release-notes/index.md
@@ -23,6 +23,15 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % ### Fixes [ecs-next-fixes]
 % *
 
+## 9.4.0 [ecs-9-4-0-release-notes]
+
+### Features and enhancements [ecs-9-4-0-features-enhancements]
+
+* Add `alpha` field maturity attribute, mirroring `beta` with mutual exclusion. [#2599](https://github.com/elastic/ecs/pull/2599)
+* Document field stability definitions (alpha, beta, GA) in design principles. [#2599](https://github.com/elastic/ecs/pull/2599)
+* Increase composable template `total_fields.limit` from 2000 to 2500. [#2584](https://github.com/elastic/ecs/pull/2584)
+* Remove the `experimental/` build pipeline and unused `cgroup.*` fields; alpha and beta fields now live in `schemas/`. [#2599](https://github.com/elastic/ecs/pull/2599)
+
 ## 9.3.0 [ecs-9-3-0-release-notes]
 
 ### Features and enhancements [ecs-9-3-0-features-enhancements]