diff --git a/CHANGELOG.md b/CHANGELOG.md
index e66c33cfcf..b5599720bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## 8.1.1
 
+**THIS UPDATE CONTAINS BREAKING CHANGES: USERNAMES OF BOTS NOW BECAME NULLABLE**
+
 * `Utils`:
     * Improve extension `Update.sourceChat` to add opportunity to select some chats by logic different with the default