# File lib/httpclient/ssl_config.rb, line 147
    def add_trust_ca(trust_ca_file_or_hashed_dir)
      @cacerts_loaded = true # avoid lazy override
      if FileTest.directory?(trust_ca_file_or_hashed_dir)
        @cert_store.add_path(trust_ca_file_or_hashed_dir)
      else
        @cert_store.add_file(trust_ca_file_or_hashed_dir)
      end
      change_notify
    end