diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 369e351..3b43a58 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -1663,13 +1663,26 @@ class Event(models.Model):
                             break
 
                 if same_imported:
-                    # reopen DuplicatedEvents if required
-                    if not event.similar(same_imported, False) and same_imported.other_versions:
-                        if same_imported.status != Event.STATUS.TRASH:
-                            if same_imported.other_versions.is_published():
-                                if same_imported.other_versions.representative != same_imported:
-                                    same_imported.other_versions.representative = None
-                                    same_imported.other_versions.save()
+                    if not event.similar(same_imported, False):
+                        # reopen DuplicatedEvents if required
+                        if same_imported.other_versions:
+                            if same_imported.status != Event.STATUS.TRASH:
+                                if same_imported.other_versions.is_published():
+                                    if same_imported.other_versions.representative != same_imported:
+                                        same_imported.other_versions.representative = None
+                                        same_imported.other_versions.save()
+                        # add a message to explain the update
+                        res = [r for r in Event.get_comparison([event, same_imported], all) if not r["similar"]]
+                        if len(res) > 0:
+                            txt = _("Updated field(s): ") + ", ".join([r["key"] for r in res])
+                            msg = Message(subject=_('Update'), 
+                                    name=_('update process'),
+                                    related_event=same_imported,
+                                    message=txt,
+                                    message_type=Message.TYPE.UPDATE_PROCESS)
+                            msg.save()
+
+
                     # we only update local information if it's a pure import and has no moderated_date
                     new_image = same_imported.image != event.image
                     same_imported.update(event, pure and same_imported.moderated_date is None) 
@@ -1911,6 +1924,7 @@ class Message(models.Model):
     class TYPE(models.TextChoices):
         FROM_CONTRIBUTOR = "from_contributor", _("From contributor")
         IMPORT_PROCESS = "import_process", _("Import process")
+        UPDATE_PROCESS = "update_process", _("Update process")
         CONTACT_FORM = "contact_form", _("Contact form")
         EVENT_REPORT = "event_report", _("Event report")
         FROM_CONTRIBUTOR_NO_MSG = "from_contrib_no_msg", _("From contributor (without message)")