Wrote on README.

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 # Hakyll

-Hakyll is a simple static site generator in Haskell.
+Hakyll is a simple static site generator in Haskell. It is mostly inspired by
+[Jekyll](http://github.com/mojombo/jekyll), but I like to believe it is
+simpler.
+
+## Configuration
+
+Inspired by [xmonad](http://xmonad.org), a small Haskell program is used as
+configuration file. In this file, you give instructions on how the site should
+be generated. In the rest of this document, we will examine a small example.
+
+## Static files
+
+Static files can be rendered using the `static` command. This command ensures
+the files will copied when you compile the site.
+
+For convenience reasons, there is also a `staticDirectory` command, which works
+recursively.
+
+    main = do
+        static "favicon.ico"
+        staticDirectory "images"
+        staticDirectory "css"
+
+## Pages
+
+Pages can be written in html or markdown (altough it would be a trivial task
+to add anything pandoc supports, just ask me if you want anything to be added).
+They can also contain metadata, which are always key-value mappings.
+
+## Templates
+
+Templates are rendered using the Haskell `Text.Template` library. This means
+that in your template, you can use `$identifier`, and it will be replaced by
+the value of `identifier`.
+
+    ---
+    author: Jasper Van der Jeugt
+    title: A sample markdown post
+    ---
+    # A sample markdown post
+
+    This is a sample markdown post. It supports pandoc extensions
+    like code highlighting. For example:
+
+    ~~~~{.haskell}
+    main = putStrLn "Hello World!"
+    ~~~~
+
+Metadata is always placed in the beginning of a file, and is delimited by a
+`---` string. The metadata can only contain simple key-value pairs. We can
+now read in this page using the `Text.Hakyll.Page.readPage` function. This
+will return a `Page`, which is actually just a `Map String String`. In this
+example, the map would consist of the following key-value pairs:
+
+- `author`: `Jasper Van der Jeugt`
+- `title`: `A sample markdown post`
+- `body`: The rest of the file (rendered to html).
+- `url`: `text.html` (the original filename was `text.markdown`, the extension
+  was changed to html).
+
+## Templates
+
+In hakyll, there is a strict separation between pages and templates. Templates,
+for example, cannot contain metadata.
+
+    <h2> $title </h2>
+    by <strong> $author </title>
+
+    $body
+
+Is a template we could, for example, render the file we saw in the previous
+section. It would go like this:
+
+    page <- readPage "text.markdown"
+    render <- renderPage "templates/sample.html" page
+
+Now, `render` will be a `Page` containing all metadata from `page`, but the
+`body` key would be replaced by the substitution. This means we can combine
+rendering actions. Given another template `templates/default.html`:
+
+    <html>
+        <head>
+            <title> $title </title>
+        </head>
+        <body>
+            $body
+        </body>
+    </html>
+
+We can now combine the rendering actions:
+
+    page <- readPage "text.markdown"
+    render <- (renderPage "templates/sample.html" page >>=
+                renderPage "templates/default.html")
+
+Of course, you can't really do anything with the render if you don't write it
+to a file somewhere. That's why the function `renderAndWrite` exists:
+
+    readPage "text.markdown" >>=
+        renderPage "templates/sample.html" page >>=
+        renderAndWrite "templates/default.html"
+
+Now, where will this file be written? In `_site/text.html`, of course! That's
+because the page still contains a key called `url`, which the renderAndWrite
+function uses to determine the file destination.
+
+## More advanced things
+
+Sometimes, you want to create a `Page` from scratch, without reading from a
+file. There are functions to do that for you, and I suggest you read the
+documentation of `Text.Hakyll.Page`.