diff --git a/lib/orient_db/migrations/create_comment.rb b/lib/orient_db/migrations/create_comment.rb
index a53be2dd639dabe776397f5abaf528a3f635d588..7d5c2523a41aa3df69c09ca214a6dc39c9e4301a 100644
--- a/lib/orient_db/migrations/create_comment.rb
+++ b/lib/orient_db/migrations/create_comment.rb
@@ -1,10 +1,8 @@
 class OrientDb::Migrations::CreateComment < OrientDb::Migration
 
   def up
-    create_class 'Comment', 'V' do |c|
-        c.property 'text', :string
-        c.property 'date_creation', :datetime
-        c.property 'last_modified', :datetime
+    create_class 'Comment', 'Object' do |c|
+      c.property 'text', :string
     end
   end
 
diff --git a/lib/orient_db/migrations/create_object.rb b/lib/orient_db/migrations/create_object.rb
index d25a6d96f6c1bd97ae9f0cf32a861438d2cff8bc..ab31234af6b6296ea11b3774e4b55f49bdc9b972 100644
--- a/lib/orient_db/migrations/create_object.rb
+++ b/lib/orient_db/migrations/create_object.rb
@@ -3,7 +3,7 @@ class OrientDb::Migrations::CreateObject < OrientDb::Migration
   def up
     create_class 'Object', 'V' do |c|
         c.property 'name', :string
-        c.property 'date_creation', :datetime
+        c.property 'created_at', :datetime
         c.property 'last_modified', :datetime
     end
   end