diff --git a/README.md b/README.md
index d21f7e3..d59b664 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,6 @@ class RelayCommand{
 
 ObservableObject ..|> INotifyPropertyChanged
 BaseViewModel --|> ObservableObject
-BaseViewModel --|> ObservableObject
 RelayCommand ..|> ICommand
 
 ```