diff --git a/docs/usage.rst b/docs/usage.rst
index b4f20d254a04db045f1577b1efc1a1eec76e9f3f..1f0b7de679c065a6ea5ff234fca23bb84e77490a 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -470,10 +470,18 @@ Let's bootstrap our machines now:
         roles:
           - bootstrap
 
-2. The ``bootstrap`` role has only one parameter - an SSH key which should be
-   deployed for the Ansible user on managed server (in the ``authorized_keys``
-   file). This defaults to content of local file ``~/.ssh/id_rsa.pub``, so no
-   need to make any changes so far.
+2. The ``bootstrap`` role has only one parameter - an SSH key which
+   should be deployed for the Ansible user on managed server (in the
+   ``authorized_keys`` file). Since this role is applied against all
+   servers, we will use the same value everywhere. Configure the role:
+
+   :file:`~/mysite/group_vars/all.yml`
+
+   ::
+
+      ---
+
+      ansible_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
 
 3. SSH into all machines at least once from the Ansible server in order to
    store the SSH fingerprints into known hosts file::
@@ -565,6 +573,8 @@ Let's take care of this common configuration right away:
 
       ---
 
+      ansible_key: "{{ lookup('file', '~/.ssh/id_rsa.pub') }}"
+
       os_users:
         - name: admin
           uid: 1000