diff --git a/blocks/upgrade.txt b/blocks/upgrade.txt
index bff229dd2f7..6add035366f 100644
--- a/blocks/upgrade.txt
+++ b/blocks/upgrade.txt
@@ -5,7 +5,9 @@ information provided here is intended especially for developers.
 
 * block_manager::get_required_by_theme_block_types() is no longer static.
 * The 'Course overview' block has been removed from core as it is being replaced by the 'My overview' block.
-  The 'Course overview' block will be available in the plugins database.
+  During the upgrade process the 'Course overview' block will be uninstalled and all its settings will be deleted.
+  If you wish to keep the 'Course overview' block and its settings, download it from moodle.org and put it back in
+  the blocks/ directory BEFORE UPGRADING.
 
 === 3.1 ===