diff --git a/CHANGES.md b/CHANGES.md
index 2f11b4e6..d3ad13ff 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -5,6 +5,7 @@
 - Fix (Accessibility): Avoid duplicate IDs
 - Testing: Switch to Cypress with code coverage for UI testing;
   use ESM version for faster debugging
+- Testing: Add map file for underscore
 - npm: Add peerDeps
 
 ## 5.1.0