diff --git a/app/models/proposition.rb b/app/models/proposition.rb
index 0ae055d..8c16d93 100644
--- a/app/models/proposition.rb
+++ b/app/models/proposition.rb
@@ -2,4 +2,6 @@ class Proposition < ActiveRecord::Base
   belongs_to :proposer, class_name: 'User'
   belongs_to :proposition_accepting, polymorphic: true
   belongs_to :proposable, polymorphic: true
+
+  enum status: [:undecided, :approved, :rejected, :backup]
 end