Add necessary SQL query to allow_quiz_question_feedback

main/install/configuration.dist.php

@@ -386,5 +386,5 @@ $_configuration['agenda_legend'] = [
 // If the MySpace page takes too long to load, you might want to remove the
 // processing of generic statistics for the user. In this case set the following to true.
 //$_configuration['tracking_skip_generic_data'] = false;
-// Show question feedback (requires DB change)
+// Show question feedback (requires DB change: "ALTER TABLE c_quiz_question ADD COLUMN feedback text;")
 //$_configuration['allow_quiz_question_feedback'] = false;