diff --git a/docs/releases/0_9_13.rst b/docs/releases/0_9_13.rst
index 373a03077..4be197f43 100644
--- a/docs/releases/0_9_13.rst
+++ b/docs/releases/0_9_13.rst
@@ -120,6 +120,7 @@ Carbon
 
 Whisper
 ^^^^^^^
+* Write optimization in ``update_many`` (timob, deniszh)
 * Add optional ``now`` parameter to fetch for graphite-web compatibility (jcsp, steve-dave)
 * Remove unused Tox configuration (steve-dave)
 * TravisCI no longer supports Python 2.5 (steve-dave)