diff --git a/doc/source/guides/multinode-lab.rst b/doc/source/guides/multinode-lab.rst
index 79a76de..658422b 100644
--- a/doc/source/guides/multinode-lab.rst
+++ b/doc/source/guides/multinode-lab.rst
@@ -89,7 +89,7 @@
 
 ::
 
-    echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+    echo "stack ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/stack
 
 From here on use the ``stack`` user. **Logout** and **login** as the
 ``stack`` user.
diff --git a/doc/source/guides/single-machine.rst b/doc/source/guides/single-machine.rst
index 03d9374..0529e30 100644
--- a/doc/source/guides/single-machine.rst
+++ b/doc/source/guides/single-machine.rst
@@ -63,7 +63,7 @@
 .. code-block:: console
 
     $ apt-get install sudo -y || yum install -y sudo
-    $ echo "stack ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
+    $ echo "stack ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/stack
 
 .. note:: On some systems you may need to use ``sudo visudo``.