diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -62,7 +62,7 @@ Web Front-End to Manage vacation(1) Sett
 
    or by appending it to the file `/etc/sudoers` (older SuSE):
 
-   >>> cat lib/ws-vacation-sudo | sudo tee /etc/sudoers
+   >>> cat lib/ws-vacation-sudo | sudo tee -a /etc/sudoers
 
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 :rem:`|||:sec:|||`\ User Management