diff --git a/README.md b/README.md
index fb46171..f41b777 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-pongo2-addons
-=============
+# pongo2-addons
 
-Official filter and tag addons for pongo2
+Official filter and tag add-ons for [pongo2](https://github.com/flosch/pongo2). Uses 3rd-party-libraries.
+
+## Filters
+
+  - **markdown** (parses markdown text and outputs HTML; **hint**: use the **safe**-filter to make the output not being escaped)
+
+## Tags
+
+(nothing yet)
\ No newline at end of file
diff --git a/filter_markdown.go b/filter_markdown.go
new file mode 100644
index 0000000..6d40363
--- /dev/null
+++ b/filter_markdown.go
@@ -0,0 +1,15 @@
+package pongo2addons
+
+import (
+	"github.com/flosch/pongo2"
+
+	"github.com/russross/blackfriday"
+)
+
+func init() {
+	pongo2.RegisterFilter("markdown", filterMarkdown)
+}
+
+func filterMarkdown(in *pongo2.Value, param *pongo2.Value) (*pongo2.Value, error) {
+	return pongo2.AsValue(string(blackfriday.MarkdownCommon([]byte(in.String())))), nil
+}