diff --git a/open_workshop_base/migrations/18.0.1.0.4/post-migration.py b/open_workshop_base/migrations/18.0.1.0.4/post-migration.py
index 18bf034..6e4e601 100644
--- a/open_workshop_base/migrations/18.0.1.0.4/post-migration.py
+++ b/open_workshop_base/migrations/18.0.1.0.4/post-migration.py
@@ -99,7 +99,8 @@ def migrate(cr, version):
         except Exception as e:
             _logger.error(f"Failed to migrate machine {m_id}: {e}")
     
-    # 3. Synchronisiere related fields von ows.machine nach maintenance.equipment
+    # 3. Synchronisiere related fields von ows.machine → maintenance.equipment
+    # Nötig weil related fields mit store=True nicht automatisch bei SQL-INSERT synchronisiert werden
     _logger.info("Synchronizing related fields (area_id, category) to maintenance.equipment...")
     
     cr.execute("""
diff --git a/open_workshop_base/models/ows_models.py b/open_workshop_base/models/ows_models.py
index 93e88f5..15885fb 100644
--- a/open_workshop_base/models/ows_models.py
+++ b/open_workshop_base/models/ows_models.py
@@ -414,6 +414,7 @@ class MaintenanceEquipment(models.Model):
     ows_machine_id = fields.One2many('ows.machine', 'equipment_id', string='OWS Maschine', readonly=True)
     
     # OWS-Felder direkt auf Equipment (via related für einfache Bearbeitung)
+    # store=True für Performance beim Filtern/Suchen
     ows_category = fields.Selection(
         related='ows_machine_id.category',
         string='Sicherheitskategorie',