diff --git a/doc/sandbox/ok_then.mdwn b/doc/sandbox/ok_then.mdwn
new file mode 100644
index 000000000..bdd528644
--- /dev/null
+++ b/doc/sandbox/ok_then.mdwn
@@ -0,0 +1,5 @@
+one two three four
+
+==one==
+
+__two__
\ No newline at end of file