diff --git a/app/models/exercise.rb b/app/models/exercise.rb
index 58d328ae..b7487399 100644
--- a/app/models/exercise.rb
+++ b/app/models/exercise.rb
@@ -20,6 +20,7 @@ class Exercise < ActiveRecord::Base
   has_many :exercise_tags
   has_many :tags, through: :exercise_tags
   accepts_nested_attributes_for :exercise_tags
+  has_many :user_exercise_feedbacks
 
   has_many :external_users, source: :user, source_type: ExternalUser, through: :submissions
   has_many :internal_users, source: :user, source_type: InternalUser, through: :submissions