diff --git a/db/migrate/20090214190337_add_watchers_user_id_type_index.rb b/db/migrate/20090214190337_add_watchers_user_id_type_index.rb
new file mode 100644
index 000000000..7ff4e542c
--- /dev/null
+++ b/db/migrate/20090214190337_add_watchers_user_id_type_index.rb
@@ -0,0 +1,9 @@
+class AddWatchersUserIdTypeIndex < ActiveRecord::Migration
+  def self.up
+    add_index :watchers, [:user_id, :watchable_type], :name => :watchers_user_id_type
+  end
+
+  def self.down
+    remove_index :watchers, :name => :watchers_user_id_type
+  end
+end