README.md in geocoder-1.7.0 vs README.md in geocoder-1.7.1

@@ -244,12 +244,15 @@
 
   # set default units to kilometers:
   units: :km,
 
   # caching (see Caching section below for details):
+  # warning: `cache_prefix` is deprecated, use `cache_options` instead
   cache: Redis.new,
-  cache_prefix: "..."
-
+  cache_options: {
+    expiration: 2.days, # Redis ttl
+    prefix: "..."
+  }
 )
 ```
 
 Please see [`lib/geocoder/configuration.rb`](https://github.com/alexreisner/geocoder/blob/master/lib/geocoder/configuration.rb) for a complete list of configuration options. Additionally, some lookups have their own special configuration options which are directly supported by Geocoder. For example, to specify a value for Google's `bounds` parameter: