diff --git a/README.md b/README.md
index bf21147..476e443 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,10 @@ We run our own private registry on a server with limited storage and it was only
 -v    shows version and quits
 -year int
       max age in days
-      
+-user
+      Username for basic authentication
+-password
+      Password for basic authentication
       
 ```
 
@@ -59,6 +62,8 @@ delete:
 
 See [the documentation](https://github.com/docker/distribution/blob/master/docs/configuration.md#delete) for details. 
 
+You might have to garbage collect to actually free disk space after using deckschrubber See [the documentation for garbage-collect](https://docs.docker.com/registry/garbage-collection/) for details.
+
 ## Examples
 
 * **Remove all images older than 2 months and 2 days**