diff --git a/docs/docsite/rst/intro_inventory.rst b/docs/docsite/rst/intro_inventory.rst
index 02c4b4c531..1ecd79ea76 100644
--- a/docs/docsite/rst/intro_inventory.rst
+++ b/docs/docsite/rst/intro_inventory.rst
@@ -44,7 +44,7 @@ A YAML version would look like:
 
   all:
     hosts:
-      mail.example.com
+      mail.example.com:
     children:
       webservers:
         hosts: