diff --git a/lib/sprockets-cache-redis/redis_store.rb b/lib/sprockets-cache-redis/redis_store.rb
index b1733ce..c4b23b1 100644
--- a/lib/sprockets-cache-redis/redis_store.rb
+++ b/lib/sprockets-cache-redis/redis_store.rb
@@ -2,17 +2,23 @@
 
 module Sprockets
   module Cache
+    # A simple Redis cache store.
+    #
+    #     environment.cache = Sprockets::Cache::RedisStore.new($redis)
+    #
     class RedisStore
       def initialize(redis_conn, key_prefix = 'sprockets')
         @redis = redis_conn
         @key_prefix = key_prefix
       end
 
+      # Lookup value in cache
       def [](key)
         data = @redis.get path_for(key)
         Marshal.load data if data
       end
 
+      # Save value to cache
       def []=(key, value)
         @redis.set path_for(key), Marshal.dump(value)
       end