diff --git a/changelog.txt b/changelog.txt
index 440f4abc..bfab2bad 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -28,6 +28,7 @@ OPENSEADRAGON CHANGELOG
 * Fixed placeholderFillStyle flicker (#727)
 * Fix for Chrome (v45) issue that key is sometimes undefined outside of the for-in loop (#730)
 * World.removeAll now cancels any in-flight image loads; same for Viewer.open and Viewer.close (#734)
+* Optimized adding large numbers of items to the world with collectionMode (#735)
 
 2.0.0: