diff --git a/app/models/comment.rb b/app/models/comment.rb
index ef5cd49c..51ce7d91 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -1,4 +1,6 @@
 class Comment < ActiveRecord::Base
   belongs_to :user
   belongs_to :answer
+  validates :user_id, presence: true
+  validates :answer_id, presence: true
 end