diff --git a/README.md b/README.md
index fb5abf4..6f1789f 100644
--- a/README.md
+++ b/README.md
@@ -15,8 +15,12 @@ This is a simple blog based on Pythons Flask framework.
 
 Blog entries are managed by plain html files in the `templates/entry/` directory.
 The first line of each document is reserved as the title of the document.
+You have to specify the filetype by extension.
+
+Currently supported filetypes are:
+- HTML (.html)
+- Markdown (.md)
 
 ## To-Do
 
-- CSS pgrade
-- Markdown support
+- CSS upgrade