diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index aa1c81d8268..df7f4353d4c 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -6,6 +6,9 @@ information provided here is intended especially for developers.
 * The maximum supported precision (the total number of digits) for XMLDB_TYPE_NUMBER ("number") fields raised from 20 to
   38 digits. Additionally, the whole number part (precision minus scale) must not be longer than the maximum length of
   integer fields (20 digits). Note that PHP floats commonly support precision of roughly 15 digits only (MDL-32113).
+* Event triggering and event handlers:
+    - The following events, deprecated since moodle 2.6, have been finally removed: groups_members_removed,
+      groups_groupings_groups_removed, groups_groups_deleted, groups_groupings_deleted.
 
 === 3.4 ===