diff --git a/lucene/CHANGES.txt b/lucene/CHANGES.txt
index 50229e12dae2..9de8f3b90096 100644
--- a/lucene/CHANGES.txt
+++ b/lucene/CHANGES.txt
@@ -177,6 +177,8 @@ Optimizations
 
 * GITHUB#12328: Optimize ConjunctionDISI.createConjunction (Armin Braun)
 
+* GITHUB#12339: Optimize part of duplicate calculation numDeletesToMerge in merge phase (fudongying)
+
 Bug Fixes
 ---------------------