diff --git a/changelog.txt b/changelog.txt
index 1359d231..39e6031c 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -11,6 +11,7 @@ OPENSEADRAGON CHANGELOG
 * Now when creating a viewer or navigator, we leave its position style alone if possible (#2393 @VIRAT9358)
 * Test improvements (#2382 @AndrewADev)
 * MouseTracker options documentation fixes (#2389 @msalsbery)
+* Improved documentation and error message for Viewport.imageToViewportZoom (#2505 @eug-L)
 * Fixed: Sometimes if the viewport was flipped and the user zoomed in far enough, it would flip back (#2364 @SebDelile)
 * Fixed: Two-finger tap on a Mac trackpad would zoom you out (#2431 @cavenel)
 * Fixed: dragToPan gesture could not be disabled when flickEnabled was activated (#2464 @jonasengelmann)