diff --git a/app/models/comment.rb b/app/models/comment.rb
index 51ce7d91..fcaf7c24 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -3,4 +3,6 @@ class Comment < ActiveRecord::Base
   belongs_to :answer
   validates :user_id, presence: true
   validates :answer_id, presence: true
+
+  validates :content, length: { maximum: 160 }
 end