diff --git a/README.md b/README.md
index f9e2562..0004bb6 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,8 @@ Push the image.
 $ docker push [registryUrl]/[imageName]:[tag]
 ```
 
-Logout from docker registry.
+Logout from docker registry (Optional, if you don't logout credentials with be
+saved at your home directory).
 ```
 $ docker logout [registryUrl]
 ```