diff --git a/redis.md b/redis.md
index 243ab9b..721a906 100644
--- a/redis.md
+++ b/redis.md
@@ -4,7 +4,7 @@ Assume you use Archlinux.
 
 Read [Redis](https://wiki.archlinux.org/index.php/Redis).
 
-Start service:
+After install `redis`, start service:
 
 ```sh
 systemctl start redis.service