diff --git a/views/event_views.xml b/views/event_views.xml
index 53e9b9e..3fd79c4 100644
--- a/views/event_views.xml
+++ b/views/event_views.xml
@@ -73,8 +73,10 @@
           <filter name="group_manager_id" string="Group manager"
             context="{'group_by': 'manager_id'}" />
           <filter name="group_years_start" string="Group years start"
-            context="{'group_by': 'date_start:years'}" />
+            context="{'group_by': 'date_start:year'}" />
 
+          <filter name="group_month" string="Group month"
+            context="{'group_by': 'date_start:month'}" />
 
         </search>
       </field>