Rails3 RC - Schema.rb file does not contain all indexes created with migration in postgresql (postgres)

Steps to reproduce:

a) run given migrations

class CreateTable < ActiveRecord::Migration
  def self.up
    create_table :business_object_type_functions do |t|
      t.string :name
      t.string :function_id
      t.string :business_object_type_id

    end
  end
end

class AddMultiColumnIndex < ActiveRecord::Migration

  def self.up
    add_index(:business_object_type_functions, :business_object_type_id)
    add_index(:business_object_type_functions, [:function_id, :business_object_type_id], :unique => true)
  end

end

b) watch the schema.rb file. It looks like this:

ActiveRecord::Schema.define(:version => 20100806074816) do

  create_table "business_object_type_functions", :force => true do |t|
    t.string   "name"
    t.string   "function_id"
    t.string   "business_object_type_id"
  end

  add_index "business_object_type_functions", ["business_object_type_id"], :name => "index_business_object_type_functions_on_business_object_type_id"

end

As you can see the schema.rb is missing the second multicolumn index that was added in the migration. I guess this might happen because of its long name. But that's just my guess.