README.rdoc in big_money-1.2.0 vs README.rdoc in big_money-1.2.1

@@ -50,9 +50,14 @@
 === Exchange
 
   require 'big_money'
   require 'big_money/exchange/yahoo' # Use yahoo finance exchange service.
 
+  # Cache it with memcache.
+  require 'moneta'
+  require 'moneta/memcache'
+  BigMoney::Exchange.cache = Moneta::Memcache.new(server: 'localhost', default_ttl: 3_600)
+
   bm = BigMoney.new('3.99', :usd)
   bm.amount   #=> BigDecimal.new('3.99')
   bm.currency #=> BigMoney::Currency::USD
 
   bm2 = bm.exchange(:aud)