diff --git a/model.py b/model.py
index 9093a7e..1111e21 100644
--- a/model.py
+++ b/model.py
@@ -60,10 +60,11 @@ class Bike(Document):
         super(Document, self).__init__(*args, **kwargs)
         self.db = connection.get_db()
 
-    def update(self, lat, lon, speed, bearing):
+    def update(self, lat, lon, speed, bearing, client_id):
         self.point = (lon, lat)
         self.speed = speed
         self.bearing = bearing
+        self.client_id = client_id
         self.last_update = datetime.datetime.now()
         self.save()