diff --git a/lib/ontologies_linked_data/models/users/user.rb b/lib/ontologies_linked_data/models/users/user.rb
index 2b06bb9b..1ba09c0c 100644
--- a/lib/ontologies_linked_data/models/users/user.rb
+++ b/lib/ontologies_linked_data/models/users/user.rb
@@ -18,6 +18,8 @@ class User < LinkedData::Models::Base
       attribute :role, enforce: [:role, :list], :default => lambda {|x| [LinkedData::Models::Users::Role.default]}
       attribute :firstName
       attribute :lastName
+      attribute :githubId, enforce: [:unique]
+      attribute :orcidId, enforce: [:unique]
       attribute :created, enforce: [:date_time], :default => lambda { |record| DateTime.now }
       attribute :passwordHash, enforce: [:existence]
       attribute :apikey, enforce: [:unique], :default => lambda {|x| SecureRandom.uuid}