diff --git a/README.md b/README.md
index 0653e86..681dd73 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 Rack::Attack is a rack middleware to protect your web app from bad clients.
 It allows *whitelisting*, *blacklisting*, *throttling*, and *tracking* based on arbitrary properties of the request.
 
-Throttle state is stored in a configurable cache (e.g. `Rails.cache`), presumably backed by memcached.
+Throttle state is stored in a configurable cache (e.g. `Rails.cache`), presumably backed by memcached or redis.
 
 ## Installation