diff --git a/ChangeLog b/ChangeLog
index 6f647ba480..b302db7349 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,7 @@ phpMyAdmin - ChangeLog
 - issue        Fix set value as selected when it has special chars on edit value enum
 - issue #16896 Fix distinct URLs broken on nullable text fields
 - issue        Fixed two possible PHP errors using INT data
+- issue        Fixed possible warning "Undefined index: output_format" on export
 
 5.1.1 (2021-06-04)
 - issue #13325 Fixed created procedure shows up in triggers and events and vice-versa