diff --git a/app/models/sensor.rb b/app/models/sensor.rb
index edd6f11..a352c9d 100644
--- a/app/models/sensor.rb
+++ b/app/models/sensor.rb
@@ -2,6 +2,7 @@
 
 class Sensor < ApplicationRecord
   belongs_to :arduino
+  belongs_to :reading
 
   validates_presence_of :local_type, :value, :unit
 end