diff --git a/diskimage_builder/elements/dynamic-login/README.rst b/diskimage_builder/elements/dynamic-login/README.rst
index 0bb510d2..5265d674 100644
--- a/diskimage_builder/elements/dynamic-login/README.rst
+++ b/diskimage_builder/elements/dynamic-login/README.rst
@@ -27,9 +27,10 @@ rootpwd
   :Description: If the operator append rootpwd="$ENCRYPTED_PASSWORD" to the
                 kernel command line on boot, the helper script will set the
                 root password to the one specified by this option. Note that
-                this password must be **encrypted**. Encrypted passwords
-                can be generated using the ``openssl`` command, e.g:
-                *openssl passwd -1*.
+                this password must be **encrypted**. Interpolation can be
+                avoided by using $$. Encrypted passwords can be generated
+                using the ``openssl`` command, e.g: *openssl passwd -1
+                -stdin <<< YOUR_PASSWORD | sed 's/\$/\$$/g'*.
 
 
 .. note::