diff --git a/backup/upgrade.txt b/backup/upgrade.txt
index 3d55558a042..a07e0b4e2b5 100644
--- a/backup/upgrade.txt
+++ b/backup/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes in /backup/*,
 information provided here is intended especially for developers.
 
-=== 4.0 ===
+=== 3.10 ===
  * Local plugins can now hook into a backup and restore process of grade items by
    using define_grade_item_plugin_structure method (See MDL-69418).