diff --git a/UPGRADING.md b/UPGRADING.md
index 17fdaca2317..a55442e974d 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -49,6 +49,20 @@ The format of this change log follows the advice given at [Keep a CHANGELOG](htt
 
   For more information see [MDL-82809](https://tracker.moodle.org/browse/MDL-82809)
 
+### mod_quiz
+
+#### Changed
+
+- The `\mod_quiz\attempt_walkthrough_from_csv_test` unit test has been marked as final and should not be extended by other tests.
+
+  All shared functionality has been moved to a new autoloadable test-case:
+  `\mod_quiz\tests\attempt_walkthrough_testcase`.
+
+  To support this testcase the existing `$files` instance property should be replaced with a new static method, `::get_test_files`.
+  Both the existing instance property and the new static method can co-exist.
+
+  For more information see [MDL-81521](https://tracker.moodle.org/browse/MDL-81521)
+
 ## 4.5
 
 ### core
diff --git a/mod/quiz/UPGRADING.md b/mod/quiz/UPGRADING.md
index c5eb504e647..efef86a8b61 100644
--- a/mod/quiz/UPGRADING.md
+++ b/mod/quiz/UPGRADING.md
@@ -1,5 +1,19 @@
 # mod_quiz Upgrade notes
 
+## 4.5+
+
+### Changed
+
+- The `\mod_quiz\attempt_walkthrough_from_csv_test` unit test has been marked as final and should not be extended by other tests.
+
+  All shared functionality has been moved to a new autoloadable test-case:
+  `\mod_quiz\tests\attempt_walkthrough_testcase`.
+
+  To support this testcase the existing `$files` instance property should be replaced with a new static method, `::get_test_files`.
+  Both the existing instance property and the new static method can co-exist.
+
+  For more information see [MDL-81521](https://tracker.moodle.org/browse/MDL-81521)
+
 ## 4.5
 
 ### Added