diff --git a/db/migrate/20120330144057_indexes_on_posts.rb b/db/migrate/20120330144057_indexes_on_posts.rb
new file mode 100644
index 000000000..523ba6c7a
--- /dev/null
+++ b/db/migrate/20120330144057_indexes_on_posts.rb
@@ -0,0 +1,5 @@
+class IndexesOnPosts < ActiveRecord::Migration
+  def change
+    add_index(:posts, [:id, :type, :created_at])
+  end
+end