diff --git a/AKModel/models.py b/AKModel/models.py
index bfa3108266a7d07a248943b41abd12dcc91ca39d..fe8bb84336ae80d9f525236ea83c9b8d8f138844 100644
--- a/AKModel/models.py
+++ b/AKModel/models.py
@@ -595,6 +595,8 @@ class Room(models.Model):
             "time_constraints": time_constraints
         }
 
+        data["fulfilled_room_constraints"].append(f"availability-room-{self.pk}")
+
         return json.dumps(data)
 
 
@@ -729,6 +731,9 @@ class AKSlot(models.Model):
         for owner in self.ak.owners.all():
             data["time_constraints"].extend(_owner_time_constraints(owner))
 
+        if self.room is not None:
+            data["room_constraints"].append(f"availability-room-{self.room.pk}")
+
         return json.dumps(data)
 
 class AKOrgaMessage(models.Model):