diff --git a/app/models/comment.rb b/app/models/comment.rb
index ae2734e23..227448da2 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -10,7 +10,7 @@ class Comment < ActiveRecord::Base
 
   validates :body, presence: true
   validates :user, presence: true
-  validates_inclusion_of :commentable_type, in: ["Debate"]
+  validates_inclusion_of :commentable_type, in: ["Debate", "Proposal"]
 
   validate :validate_body_length