diff --git a/changelog.txt b/changelog.txt
index 5ec7c82d..1017ccbf 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -6,6 +6,7 @@ OPENSEADRAGON CHANGELOG
 * Improved the constraints that keep the image in the viewer, specifically when zoomed out a lot (#2160 @joedf)
 * You can now provide an element for the navigator (as an alternative to an ID) (#1303 @cameronbaney, #2166 #2175 @joedf)
 * Now supporting IIIF "id" and "identifier" in addition to "@id" (#2173 @ahankinson)
+* We now delegate tile fetching and caching to the TileSource, to allow for custom tile formats (#2148 @Aiosa)
 
 3.1.0: