diff --git a/README.md b/README.md
index df179e5..eb35d32 100644
--- a/README.md
+++ b/README.md
@@ -3,10 +3,16 @@ This is a small hack to send faxes via the sipgate REST API from the command lin
 
 ## Deployment
 Add your login credentials to `login_credentials_muster.sh` and rename the file to `.env`
+
 If you use Letterheads Address database, uncomment the last line of that file and add `your/path/to/Letterhead` 
 
 ## Usage
 `./fax.sh <letter.pdf> <recipient>`
+	With a german fax number `<recipient>`
+`./fax.sh <letter.pdf> -handle <handle>`
+	Asks Letterhead's address database for <handle>'s fax number.
+`$ ./fax.sh -help`
+	Print usage Message and exit
 
 sipgate doesn't accept pdf files larger than 30 pages or 10MB.