diff --git a/doc/sandbox.mdwn b/doc/sandbox.mdwn
index bb486bd2c..02b636c09 100644
--- a/doc/sandbox.mdwn
+++ b/doc/sandbox.mdwn
@@ -101,3 +101,5 @@ testing
 
 --
 [[!toc  levels=2]]
+
+[[Mamma Mia]]