diff --git a/README.md b/README.md
index 35cdbcf..d652864 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ use Rack::Session::Redis
 # Alternatively you can specify options to use:
 use Rack::Session::Redis,
   :redis_server => "redis://redis:6379/0",
-  :expires_in => 3600 # Seconds. If you are using ActiveSupport you can use 1.hour
+  :expire_after => 3600 # Seconds. If you are using ActiveSupport you can use 1.hour
 ```
 
 ## Development