diff --git a/README.md b/README.md
index b8f4d3b..9cf43d2 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ useradd --create-home user
 passwd user
 
 # Add the "sudo" group for the created user
-usermod -aG sudo user
+usermod --add --groups sudo user
 ```
 
 ### As user