diff --git a/readme.md b/readme.md
index aeeb5dc..576a78b 100644
--- a/readme.md
+++ b/readme.md
@@ -58,7 +58,7 @@ cp readme.txt readme.bak.txt
 Copy `myMusic` folder under `myMedia` folder
 
 ```
-cp -R myMusic myMedia
+cp -a myMusic myMedia
 ```
 
 ## <a id="duplicatefolder"></a>duplicate a folder
@@ -68,7 +68,7 @@ cp -R myMusic myMedia
 If `myMedia` folder doesn't exist
 
 ```
-cp -R myMusic myMedia
+cp -a myMusic myMedia
 ```
 
 ## <a id="movefile"></a>move a file