diff --git a/README.md b/README.md
index f5f1e59b31e11d4f4c0242e0888e698371c65be6..f7c0588f22961367fbd3285b4cb3afa49ac90e7d 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ CEPC offline software prototype based on [Key4hep](https://github.com/key4hep).
 
 ## Quick start
 
-Start the container in lxslc7 (OS: CentOS7):
+Start an SL6 container in lxslc7 (OS: CentOS7):
 ```
 $ /cvmfs/container.ihep.ac.cn/bin/hep_container shell SL6
 ```