diff --git a/markdown/another.html.mkd b/markdown/another.html.mkd
new file mode 100644
index 0000000..899ea40
--- /dev/null
+++ b/markdown/another.html.mkd
@@ -0,0 +1 @@
+This is another markdown document.
diff --git a/markdown/index.html.markdown b/markdown/index.html.markdown
new file mode 100644
index 0000000..05d33d7
--- /dev/null
+++ b/markdown/index.html.markdown
@@ -0,0 +1,5 @@
+# Markdown
+
+This is a markdown document.
+
+You can use these file extension: `.html.markdown`, `.html.mkd`, `.html.md`, `.markdown`.
diff --git a/markdown/the_other.html.md b/markdown/the_other.html.md
new file mode 100644
index 0000000..d36c633
--- /dev/null
+++ b/markdown/the_other.html.md
@@ -0,0 +1 @@
+This is the other markdown document.