diff --git a/site.yml.sample b/site.yml.sample
index da6ecb372..9162b8b10 100644
--- a/site.yml.sample
+++ b/site.yml.sample
@@ -69,6 +69,10 @@
         - ansible_distribution == 'Fedora'
         - ansible_distribution_major_version|int >= 23
 
+    - name: validate vars
+      validate:
+        mode: permissive
+
 - hosts: mons
   gather_facts: false
   become: True