diff --git a/doc/source/index.rst b/doc/source/index.rst
index 9f477ab..08ce4cb 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -63,7 +63,7 @@
 .. code-block:: console
 
     $ echo "stack ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/stack
-    $ sudo su - stack
+    $ sudo -u stack -i
 
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