diff --git a/biscuit/apps/chronos/urls.py b/biscuit/apps/chronos/urls.py
index f9f4e7765d5832814bc2f82c13a5f3e1fe00729c..15fe30acf23423a061b3a462e164cdd5efa82aae 100644
--- a/biscuit/apps/chronos/urls.py
+++ b/biscuit/apps/chronos/urls.py
@@ -8,6 +8,6 @@ urlpatterns = [
     path('timetable/<int:week>', views.timetable, name='timetable_by_week'),
     path('lessons', views.lessons_day, name='lessons_day'),
     path('lessons/<when>', views.lessons_day, name='lessons_day_by_date'),
-    path('lessons/<int:id_>/<int:week>/substition', views.edit_substitution, name='edit_substitution')
+    path('lessons/<int:id_>/<int:week>/substition', views.edit_substitution, name='edit_substitution'),
     path('lessons/<int:id_>/<int:week>/substition/delete', views.delete_substitution, name='delete_substitution')
 ]