diff --git a/docs/src/main/sphinx/release/release-400.md b/docs/src/main/sphinx/release/release-400.md
index 3083e745f2a2..0d5a68f420bc 100644
--- a/docs/src/main/sphinx/release/release-400.md
+++ b/docs/src/main/sphinx/release/release-400.md
@@ -4,6 +4,8 @@
 
 * Add output buffer utilization to `EXPLAIN ANALYZE VERBOSE`. ({issue}`14396`)
 * Increase concurrency for large clusters. ({issue}`14395`)
+* Fix JSON serialization failure for `QueryCompletedEvent` in event listener.
+  ({issue}`14604`)
 
 ## BigQuery connector