diff --git a/build.go b/build.go
index a6e9540..faa5b36 100644
--- a/build.go
+++ b/build.go
@@ -3,7 +3,6 @@ package main
 import (
 	"os"
 	"path/filepath"
-	"strings"
 )
 
 func cleanDirectory() error {
@@ -32,8 +31,7 @@ func build() error {
 		return err
 	}
 	for path, page := range siteMap {
-		// TODO don't do this for js, css, etc. pages
-		if !page.Static && !strings.HasSuffix(path, ".html") {
+		if !page.Static && filepath.Ext(path) == "" {
 			path = filepath.Join(path, "/index.html")
 		}
 		src := filepath.Join(siteConfig.SourceDir, page.Path)
diff --git a/page.go b/page.go
index 1d0f198..0c7a6a5 100644
--- a/page.go
+++ b/page.go
@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strings"
 
 	"github.com/acstech/liquid"
 	"github.com/russross/blackfriday"
@@ -72,7 +73,8 @@ func (p Page) Data() map[interface{}]interface{} {
 	}
 }
 
-func readPage(path string, defaults map[interface{}]interface{}) (p *Page, err error) {
+// ReadPage reads a Page from a file, using defaults as the default front matter.
+func ReadPage(path string, defaults map[interface{}]interface{}) (p *Page, err error) {
 	var (
 		frontMatter map[interface{}]interface{}
 		static      = true
@@ -128,10 +130,15 @@ func readPage(path string, defaults map[interface{}]interface{}) (p *Page, err e
 	return p, nil
 }
 
+// Source returns the file path of the page source.
+func (p *Page) Source() string {
+	return filepath.Join(siteConfig.SourceDir, p.Path)
+}
+
 // Render applies Liquid and Markdown, as appropriate.
-func (p Page) Render(w io.Writer) error {
+func (p *Page) Render(w io.Writer) error {
 	if p.Static {
-		source, err := ioutil.ReadFile(filepath.Join(siteConfig.SourceDir, p.Path))
+		source, err := ioutil.ReadFile(p.Source())
 		if err != nil {
 			return err
 		}
@@ -139,21 +146,17 @@ func (p Page) Render(w io.Writer) error {
 		return err
 	}
 
-	var (
-		path = p.Path
-		ext  = filepath.Ext(path)
-	)
-
+	defer fmt.Println("While processing", p.Source())
 	template, err := liquid.Parse(p.Content, nil)
 	if err != nil {
-		err := &os.PathError{Op: "Liquid Error", Path: path, Err: err}
+		err := &os.PathError{Op: "Liquid Error", Path: p.Source(), Err: err}
 		return err
 	}
 	writer := new(bytes.Buffer)
 	template.Render(writer, stringMap(p.Data()))
 	body := writer.Bytes()
 
-	if ext == ".md" {
+	if isMarkdown(p.Path) {
 		body = blackfriday.MarkdownCommon(body)
 	}
 
@@ -161,6 +164,11 @@ func (p Page) Render(w io.Writer) error {
 	return err
 }
 
+func isMarkdown(path string) bool {
+	ext := filepath.Ext(path)
+	return siteConfig.MarkdownExtensions()[strings.TrimLeft(ext, ".")]
+}
+
 func expandPermalinkPattern(pattern string, data map[interface{}]interface{}, path string) string {
 	if p, found := permalinkStyles[pattern]; found {
 		pattern = p
@@ -176,9 +184,8 @@ func expandPermalinkPattern(pattern string, data map[interface{}]interface{}, pa
 		title          = getString(data, "title", name)
 	)
 
-	if ext == ".md" {
-		outputExt = ""
-		localPath = localPath[:len(localPath)-len(ext)]
+	if isMarkdown(path) {
+		outputExt = ".html"
 	}
 
 	if val, found := data["collection"]; found {
diff --git a/site.go b/site.go
index f5a9edb..4a7caff 100644
--- a/site.go
+++ b/site.go
@@ -13,15 +13,18 @@ import (
 // SiteConfig is the Jekyll site configuration, typically read from _config.yml.
 // See https://jekyllrb.com/docs/configuration/#default-configuration
 type SiteConfig struct {
-	//Where things are:
-	SourceDir      string // `source`
+	// Where things are:
+	SourceDir      string `yaml:"source"`
 	DestinationDir string `yaml:"destination"`
 	Collections    map[string]interface{}
 
+	// Handling Reading
+	Include     []string
+	Exclude     []string
+	MarkdownExt string `yaml:"markdown_ext"`
+
+	// Outputting
 	Permalink string
-	Safe      bool
-	Exclude   []string
-	Include   []string
 }
 
 const siteConfigDefaults = `
@@ -57,12 +60,23 @@ var siteConfig SiteConfig
 var siteMap map[string]*Page
 
 var siteData = map[interface{}]interface{}{}
+
+// For unit tests
+func init() {
+	siteConfig.setDefaults()
+}
+
+func (c *SiteConfig) setDefaults() {
+	if err := yaml.Unmarshal([]byte(siteConfigDefaults), &siteData); err != nil {
+		panic(err)
+	}
+	if err := yaml.Unmarshal([]byte(siteConfigDefaults), &siteConfig); err != nil {
+		panic(err)
+	}
 }
 
 func (c *SiteConfig) read(path string) error {
-	if err := yaml.Unmarshal([]byte(siteConfigDefaults), c); err != nil {
-		return err
-	}
+	c.setDefaults()
 	switch configBytes, err := ioutil.ReadFile(path); {
 	case err != nil && !os.IsNotExist(err):
 		return nil
@@ -76,6 +90,11 @@ func (c *SiteConfig) read(path string) error {
 	}
 }
 
+// MarkdownExtensions returns a set of markdown extension.
+func (c *SiteConfig) MarkdownExtensions() map[string]bool {
+	extns := strings.SplitN(siteConfig.MarkdownExt, `,`, -1)
+	return stringArrayToMap(extns)
+}
 func buildSiteMap() (map[string]*Page, error) {
 	basePath := siteConfig.SourceDir
 	fileMap := map[string]*Page{}