diff --git a/lucene/CHANGES.txt b/lucene/CHANGES.txt
index c23e1fb7bda..aa814439ce5 100644
--- a/lucene/CHANGES.txt
+++ b/lucene/CHANGES.txt
@@ -191,6 +191,9 @@ Optimizations
 * LUCENE-5960: Use a more efficient bitset, not a Set<Integer>, to
   track visited states.  (Markus Heiden via Mike McCandless)
 
+* LUCENE-5959: Don't allocate excess memory when building automaton in
+  finish. (Markus Heiden via Mike McCandless)
+
 Build
 
 * LUCENE-5909: Smoke tester now has better command line parsing and