diff --git a/docs/about.rst b/docs/about.rst
index 515f83e9cce7cc226164c1176279c90302c59833..ffbf0ee8afab7cbe114d64aa32665013a1d03a1d 100644
--- a/docs/about.rst
+++ b/docs/about.rst
@@ -18,8 +18,9 @@ At the moment, the roles have been written for and tested against **Ansible
 2.9.x**.
 
 The roles also utilise the ``ipv4/ipv6`` lookup plugins which require
-``netaddr`` package to be installed. Make sure you have the packages
-available on controller machine.
+``netaddr`` package to be installed. The ``passlib`` package is used
+for hashing the operating system passwords. Make sure you have the
+packages available on controller machine.
 
 
 Why were these roles created?