diff --git a/test.yml b/test.yml
index ad68e07da..5364223a5 100644
--- a/test.yml
+++ b/test.yml
@@ -38,7 +38,7 @@
       #a:
       b:
       c: # Space
-      #d:	# Tab
+      #d:	# Tabs NO LONGER ALLOWED, in strict YAML: https://stackoverflow.com/a/19976827
       e: ''
       f: ""