diff --git a/README.md b/README.md
index b0b3f3d..56f2926 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ There will be 3 modules available:
 
 ```python
 import admidio_python_api.admidio as admidio
-adm = admidio.Admidio(mysql_host, mysql_user, mysql_password, mysql_database)
+adm = admidio.Admidio(mysql_host, mysql_user, mysql_password, mysql_database, db_prefix)
 ```
 
 It will initialise all groups and users that are in the admidio installation.