diff --git a/bbb_django/bbb/models.py b/bbb_django/bbb/models.py
index d70f61e..6ede6dd 100755
--- a/bbb_django/bbb/models.py
+++ b/bbb_django/bbb/models.py
@@ -40,7 +40,7 @@ class Meeting(models.Model):
     name = models.CharField(max_length=100, verbose_name=_('meeting name'))
     attendee_password = models.CharField(max_length=50, verbose_name=_('attendee password'))
     moderator_password = models.CharField(max_length=50, verbose_name=_('moderator password'))
-    welcome = models.CharField(max_length=100, verbose_name=_('welcome message'))
+    welcome = models.CharField(max_length=100, blank=True, verbose_name=_('welcome message'))
     record = models.BooleanField(default=False, verbose_name=_('record'))
     duration = models.IntegerField(default=0, choices=MEETING_DURATION, verbose_name=_('duration'))
     start_time = models.DateTimeField(verbose_name=_('start time'))
diff --git a/bbb_django/bbb/views/core.py b/bbb_django/bbb/views/core.py
index a018b2b..230b4d0 100644
--- a/bbb_django/bbb/views/core.py
+++ b/bbb_django/bbb/views/core.py
@@ -44,7 +44,7 @@ def export_meeting(request, meeting_id):
     cal.add_component(event)
     #print cal.to_ical()
     response = HttpResponse(cal.to_ical(), mimetype='text/calendar')
-    response['Content-Disposition'] = 'attachment; filename=%s.ics'%meeting.name
+    response['Content-Disposition'] = 'attachment; filename=%s.ics'%meeting.name.encode('utf8')
     return response
 
 @login_required
diff --git a/bbb_django/initial.sh b/bbb_django/initial.sh
index 3cab4db..4b9e79d 100755
--- a/bbb_django/initial.sh
+++ b/bbb_django/initial.sh
@@ -3,3 +3,5 @@
 `which python` manage.py schemamigration bbb --initial
 sudo apt-get install language-pack-zh-base
 echo 'Please update the "SALT" and "BBB_API_URL" in "bbb/local_settings.py"' 
+
+#use manage.py convert_to_south myapp to convert the old app 
diff --git a/requirements.txt b/requirements.txt
index 97d19e4..562dd4f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ Django==1.3
 flup
 South
 pytz
-calendar
+icalendar