diff --git a/biscuit/apps/chronos/urls.py b/biscuit/apps/chronos/urls.py
index 7a414cbffaaffff2e0cf0fc4990041e5b770cfbe..6720c5c3e00d95176826fab273908686fba466ae 100644
--- a/biscuit/apps/chronos/urls.py
+++ b/biscuit/apps/chronos/urls.py
@@ -6,6 +6,6 @@ from . import views
 urlpatterns = [
     path('timetable', views.timetable, name='timetable'),
     path('lessons', views.lessons_day, name='lessons_day'),
-    path('lessons/<when>', views.lessons_day, name='lessons_day_by_date')
+    path('lessons/<when>', views.lessons_day, name='lessons_day_by_date'),
     path('substitutions/<id>/edit', views.edit_substitution, name='edit_substitution')
 ]