diff --git a/main/inc/lib/course.lib.php b/main/inc/lib/course.lib.php
index c289b5a212..9fb4516d73 100755
--- a/main/inc/lib/course.lib.php
+++ b/main/inc/lib/course.lib.php
@@ -2201,6 +2201,9 @@ class CourseManager
             Database::query($sql);
             $sql = "DELETE FROM $table_stats_online WHERE c_id = $courseId";
             Database::query($sql);
+            // Do not delete rows from track_e_default as these include course
+            // creation and other important things that do not take much space
+            // but give information on the course history
             //$sql = "DELETE FROM $table_stats_default WHERE c_id = $courseId";
             //Database::query($sql);
             $sql = "DELETE FROM $table_stats_downloads WHERE c_id = $courseId";