diff --git a/db/migrate/20200816003344_add_http_referer_to_access_logs.rb b/db/migrate/20200816003344_add_http_referer_to_access_logs.rb
new file mode 100644
index 0000000..573d89a
--- /dev/null
+++ b/db/migrate/20200816003344_add_http_referer_to_access_logs.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+# Con access_log v0.3 podemos decidir la política de retención de
+# referencias.
+class AddHttpRefererToAccessLogs < ActiveRecord::Migration[6.0]
+  def change
+    return unless Rails.env.production?
+
+    add_column :access_logs, :http_referer, :string, index: true
+  end
+end