book = models.ForeignKey('Book', editable=False, verbose_name=_('book'))
     number = models.IntegerField(_('number'))
-    slug = models.SlugField(_('slug'))
     title = models.CharField(_('title'), max_length=255, blank=True)
+    slug = models.SlugField(_('slug'))
+    gallery_start = models.IntegerField(_('gallery start'), null=True, blank=True, default=1)
 
     # cache
     _short_html = models.TextField(null=True, blank=True, editable=False)
         ordering = ['number']
         verbose_name = _('chunk')
         verbose_name_plural = _('chunks')
+        permissions = [('can_pubmark', 'Can mark for publishing')]
 
     # Representing
     # ============
     # Creating and manipulation
     # =========================
 
-    def split(self, slug, title='', adjust_slug=False, **kwargs):
+    def split(self, slug, title='', **kwargs):
         """ Create an empty chunk after this one """
         self.book.chunk_set.filter(number__gt=self.number).update(
                 number=models.F('number')+1)