diff --git a/changelog.txt b/changelog.txt
index 0bbf6629..ab43c6d9 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -3,6 +3,7 @@ OPENSEADRAGON CHANGELOG
 
 2.4.3: (In progress)
 
+* Now when "simple image" tile sources are removed from the viewer, they free the memory used by the pyramid they create (#1789 @TakumaKira)
 
 2.4.2: