diff --git a/ansible/README.md b/ansible/README.md
new file mode 100644
index 0000000..a5ecee2
--- /dev/null
+++ b/ansible/README.md
@@ -0,0 +1,5 @@
+Ping host (host label from inventory)
+```shell
+ansible-playbook --extra-vars "hosts=<hosts>" playbooks/ping_workers.yml
+```
+
diff --git a/ansible/playbooks/ping_workers.yml b/ansible/playbooks/ping_workers.yml
index 9088d82..df3d869 100644
--- a/ansible/playbooks/ping_workers.yml
+++ b/ansible/playbooks/ping_workers.yml
@@ -1,5 +1,5 @@
 - name: Ping workers
-  hosts: workers
+  hosts: "{{ hosts }}"
   gather_facts: False
   roles:
     - { role: ../roles/ping }