diff --git a/question/engine/upgrade.txt b/question/engine/upgrade.txt
index 04d1f23b39b..a6c03c2eeea 100644
--- a/question/engine/upgrade.txt
+++ b/question/engine/upgrade.txt
@@ -1,7 +1,7 @@
 This files describes API changes for the core question system.
 
 
-=== 2.4 ===
+=== 2.6 ===
 
 1) The method question_behaviour::is_manual_grade_in_range and move and become
 question_engine::is_manual_grade_in_range.