diff --git a/biscuit/apps/chronos/tables.py b/biscuit/apps/chronos/tables.py
index 0f4dc1b15783a0c3e596082a774a36f0b553fc93..ac2bcb18fd54c045286a638c152788d546d539c7 100644
--- a/biscuit/apps/chronos/tables.py
+++ b/biscuit/apps/chronos/tables.py
@@ -20,8 +20,8 @@ class LessonsTable(tables.Table):
         row_attrs = {'class': _css_class_from_lesson_state}
 
     period__period = tables.Column(accessor='period.period')
-    lesson__groups = tables.Column(accessor='lesson.group_names')
-    lesson__teachers = tables.Column(accessor='lesson.teacher_names')
+    lesson__groups = tables.Column(accessor='lesson.group_names', verbose_name=_('Groups'))
+    lesson__teachers = tables.Column(accessor='lesson.teacher_names', verbose_name=_('Teachers'))
     lesson__subject = tables.Column(accessor='lesson.subject')
     room = tables.Column(accessor='room')
     edit = tables.LinkColumn('edit_substitution_by_id', args=[A('id')])