diff --git a/oxdbarchive/model.py b/oxdbarchive/model.py
index 4ae93c8..9ee146d 100644
--- a/oxdbarchive/model.py
+++ b/oxdbarchive/model.py
@@ -207,6 +207,14 @@ class Archive(SQLObject):
   def bootstrapFrontend(self):
     for f in self.files:
       self.notifyFrontend('add', f.md5sum)
+  
+  def fillFrontend(self):
+    data = read_url("%s/list" % self.baseUrlFrontend)
+    files = simplejson.loads(data)
+    md5sums = [str(f['md5sum']) for f in files.values()]
+    for f in ArchiveFile.select(NOT(IN(ArchiveFile.q.md5sum, md5sums))):
+      self.notifyFrontend('add', f.md5sum)
+  
 
 class ArchiveFile(SQLObject):
   '''
diff --git a/oxdbarchive/tools/extract_timeline.py b/oxdbarchive/tools/extract_timeline.py
index 1dd0c63..9870fab 100755
--- a/oxdbarchive/tools/extract_timeline.py
+++ b/oxdbarchive/tools/extract_timeline.py
@@ -104,7 +104,7 @@ class GstTimeline:
 
 def usage():
   print ""
-  print "usage: %s output_base_path video_file" % sys.argv[0]
+  print "usage: %s output.png video_file" % sys.argv[0]
   print ""
   sys.exit(1)