diff --git a/doc/sandbox.mdwn b/doc/sandbox.mdwn
index f19e9afa0..4b6b9f270 100644
--- a/doc/sandbox.mdwn
+++ b/doc/sandbox.mdwn
@@ -96,3 +96,6 @@ Let's see what happens... ~~
 
 
 testing
+
+--
+[[!toc  levels=2]]