diff --git a/docs/release-notes/index.md b/docs/release-notes/index.md
index 2c26c96aae6..77205155be3 100644
--- a/docs/release-notes/index.md
+++ b/docs/release-notes/index.md
@@ -21,6 +21,17 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % ### Fixes [logstash-next-fixes]
 % *
 
+## 9.1.8 [logstash-9.1.8-release-notes]
+
+No user-facing changes in Logstash core.
+
+### Plugins [logstash-plugin-9.1.8-changes]
+
+**Split Filter - 3.1.10**
+
+* Added trace log to track event size expansion [#49](https://github.com/logstash-plugins/logstash-filter-split/pull/49)
+* [DOC] Added introductory statement to clarify purpose of the plugin [#43](https://github.com/logstash-plugins/logstash-filter-split/pull/43)
+
 ## 9.1.7 [logstash-9.1.7-release-notes]
 
 ### Features and enhancements [logstash-9.1.7-features-enhancements]
@@ -457,4 +468,4 @@ Check out the [security advisory](https://discuss.elastic.co/c/announcements/sec
 
 **Tcp Output - 7.0.0**
 
-* Remove deprecated SSL settings [#58](https://github.com/logstash-plugins/logstash-output-tcp/pull/58)
\ No newline at end of file
+* Remove deprecated SSL settings [#58](https://github.com/logstash-plugins/logstash-output-tcp/pull/58)