diff --git a/lang/en/attforblock.php b/lang/en/attforblock.php
index 0673f77..a42d284 100644
--- a/lang/en/attforblock.php
+++ b/lang/en/attforblock.php
@@ -94,7 +94,6 @@ $string['includeall'] = 'Select all sessions';
 $string['includenottaken'] = 'Include not taken sessions';
 $string['indetail'] = 'In detail...';
 $string['jumpto'] = 'Jump to';
-$string['moduledescription'] = 'Removal of this module will not entail removal of the data!';
 $string['modulename'] = 'Attendance';
 $string['modulenameplural'] = 'Attendances';
 $string['months'] = 'Months';
diff --git a/lang/ru/attforblock.php b/lang/ru/attforblock.php
index 2667152..3215395 100644
--- a/lang/ru/attforblock.php
+++ b/lang/ru/attforblock.php
@@ -80,7 +80,6 @@ $string['includeall'] = 'Выбрать все занятия';
 $string['includenottaken'] = 'Включить не прошедшие занятия';
 $string['indetail'] = 'Подробнее...';
 $string['jumpto'] = 'Перейти к занятию ';
-$string['moduledescription'] = 'Удаление этого модуля не повлечет удаление данных о посещаемости!';
 $string['modulename'] = 'Посещаемость';
 $string['modulenameplural'] = 'Посещаемость';
 $string['months'] = 'Месяц';
diff --git a/lib.php b/lib.php
index 791100d..0ee6110 100644
--- a/lib.php
+++ b/lib.php
@@ -102,16 +102,23 @@ function attforblock_delete_instance($id) {
         return false;
     }
     
-    $result = $DB->delete_records('attforblock', array('id'=> $id));
+	if ($sess = $DB->get_records('attendance_sessions', array('attendanceid'=> $id), '', 'id')) {
+        $slist = implode(',', array_keys($sess));
+        $DB->delete_records_select('attendance_log', "sessionid IN ($slist)");
+        $DB->delete_records('attendance_sessions', array('attendanceid'=> $id));
+    }
+	$DB->delete_records('attendance_statuses', array('attendanceid'=> $id));
+
+    $DB->delete_records('attforblock', array('id'=> $id));
 
     attforblock_grade_item_delete($attforblock);
 
-    return $result;
+    return true;
 }
 
 function attforblock_delete_course($course, $feedback=true){
 
-        global $DB;
+    global $DB;
         
 	if ($sess = $DB->get_records('attendance_sessions', array('courseid'=> $course->id), '', 'id')) {
         $slist = implode(',', array_keys($sess));
diff --git a/mod_form.php b/mod_form.php
index a28c778..11a0c2f 100644
--- a/mod_form.php
+++ b/mod_form.php
@@ -21,8 +21,6 @@ class mod_attforblock_mod_form extends moodleform_mod {
         $mform->addRule('name', null, 'required', null, 'client');
         $mform->setDefault('name', get_string('modulename', 'attforblock'));
         
-        $mform->addElement('static', 'attdescription', '', get_string('moduledescription', 'attforblock'));
-
         $mform->addElement('modgrade', 'grade', get_string('grade'));
         $mform->setDefault('grade', 100);