diff --git a/docs/usage.rst b/docs/usage.rst
index cad8584f4b670c9d6ab33942a76a8ff96d15d231..a82cf456f7323ab30648cf7c1dc20906a0e51cde 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -2267,6 +2267,15 @@ So, back to the business:
 
 2. And now to configure backup clients for all servers:
 
+   .. warning::
+      By default Ansible's file lookup plugin will strip newlines and
+      spaces from the end of the file. This is a problem when
+      deploying the RSA ssh keys, since if there is no newline after
+      the ``-----END OPENSSH PRIVATE KEY-----`` delimeter, ssh client
+      will report error about the format of the key file being
+      invalid. Therefore the example below explicitly disables
+      stripping newline from the end of the file.
+
    :file:`~/mysite/group_vars/all.yml`
    ::
 
@@ -2277,7 +2286,7 @@ So, back to the business:
         - "{{ lookup('file', inventory_dir + '/ssh/bak_rsa_key.pub') }}"
         - "{{ lookup('file', inventory_dir + '/ssh/bak_ed25519_key.pub') }}"
         - "{{ lookup('file', inventory_dir + '/ssh/bak_ecdsa_key.pub') }}"
-      backup_ssh_key: "{{ lookup('file', inventory_dir + '/ssh/' + ansible_fqdn) }}"
+      backup_ssh_key: "{{ lookup('file', inventory_dir + '/ssh/' + ansible_fqdn, rstrip=False) }}"
 
 3. So, looking at the configuration up there, there is a couple of file lookups
    for getting the variable values, as well as one pipe lookup for fetching the