diff --git a/Dockerfile b/Dockerfile
index abf1be9e..1533419a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # How to test Makefile
 # 1.Build this Dockerfile
 #   docker build -t dotfiles /home/${USER}/src/github.com/masasam/dotfiles
-# 2.Run docker run
+# 2.Run 'docker run' mounting the dropbox directory
 #   docker run -t -i -v /home/${USER}/Dropbox:/home/${USER}/Dropbox:cached --name arch dotfiles /bin/bash
 # 3.Execute the following command in the docker container
 #   cd /home/${USER}/src/github.com/masasam/dotfiles
diff --git a/README.md b/README.md
index 55d5a231..fc7d6faa 100644
--- a/README.md
+++ b/README.md
@@ -707,7 +707,7 @@ Font
 
 	docker build -t dotfiles /home/${USER}/src/github.com/masasam/dotfiles
 
-2.Run docker run
+2.Run 'docker run' mounting the dropbox directory
 
 	docker run -t -i -v /home/${USER}/Dropbox:/home/${USER}/Dropbox:cached --name arch dotfiles /bin/bash