diff --git a/org_mode_samples/object/text_markup/double_star.org b/org_mode_samples/object/text_markup/double_star.org
index c758a3d..3cc032d 100644
--- a/org_mode_samples/object/text_markup/double_star.org
+++ b/org_mode_samples/object/text_markup/double_star.org
@@ -1 +1,3 @@
+**foo**
+
 foo ** bar ** baz
diff --git a/org_mode_samples/object/text_markup/double_underscore.org b/org_mode_samples/object/text_markup/double_underscore.org
new file mode 100644
index 0000000..2664fa1
--- /dev/null
+++ b/org_mode_samples/object/text_markup/double_underscore.org
@@ -0,0 +1 @@
+__foo_bar_baz__