diff --git a/lib/ansible/plugins/lookup/nios.py b/lib/ansible/plugins/lookup/nios.py
index 31e5865f28..723f49dabe 100644
--- a/lib/ansible/plugins/lookup/nios.py
+++ b/lib/ansible/plugins/lookup/nios.py
@@ -88,7 +88,7 @@ obj_type:
     - The object type specified in the terms argument
   returned: always
   type: complex
-  contains
+  contains:
     obj_field:
       - One or more obj_type fields as specified by return_fields argument or
         the default set of fields as per the object type