diff --git a/TODOS.md b/TODOS.md
index c69062e..9bad994 100644
--- a/TODOS.md
+++ b/TODOS.md
@@ -46,16 +46,21 @@
 - [ ] Import/export packages. Hugo, jekyll, WordPress, etc.
 - [ ] Review every file in thor
   - [ ] Review assets.odin
-  - [ ] Review alerts.odin
   - [ ] Review content.odin
-  - [ ] Review emoji.odin
+  - [ ] Review defaults.odin
   - [ ] Review feed.odin
-  - [ ] Review footnotes.odin
   - [ ] Review frontmatter.odin
-  - [ ] Review highlight.odin
   - [ ] Review main.odin
-  - [ ] Review minifiy.odin
+  - [ ] Review minify.odin
+  - [ ] Review `markdown/`
+    - [ ] Review alerts.odin
+    - [ ] Review emoji.odin
+    - [ ] Review footnotes.odin
+    - [ ] Review footnotes_test.odin
+    - [ ] Review highlight.odin
+    - [ ] Review markdown.odin
+    - [ ] Review sectionate.odin
   - [ ] Review render.odin
-  - [ ] Review sectionate.odin
   - [x] Review site.odin
-  - [ ] Review tree_sitter.odin
+  - [ ] Review treesitter/treesitter.odin
+  - [ ] Review vfs.odin
diff --git a/content.odin b/content.odin
index e4f748f..0baa811 100644
--- a/content.odin
+++ b/content.odin
@@ -1,6 +1,6 @@
 package main
 
-import cm "vendor:commonmark"
+import md "markdown"
 
 import "core:fmt"
 import "core:log"
@@ -101,7 +101,7 @@ load_page :: proc(
 	section: string,
 	slug: string,
 	is_index: bool,
-	ext: bit_set[Markdown_Extension],
+	ext: bit_set[md.Extension],
 ) -> (
 	page: Page,
 	ok: bool,
@@ -132,29 +132,7 @@ load_page :: proc(
 	if strings.has_suffix(file_path, ".html") {
 		page.body_html = strings.clone(body)
 	} else {
-		sn_defs := make(map[string]string)
-		mn_defs := make(map[string]string)
-		clean_body := body
-		if .Sidenotes in ext {
-			clean_body, sn_defs, mn_defs = strip_definitions(body)
-		}
-		html := cm.markdown_to_html_from_string(clean_body, {.Unsafe})
-		if .Emoji in ext {
-			html = expand_emoji(html)
-		}
-		if .Sidenotes in ext {
-			html = inject_notes(html, sn_defs, mn_defs)
-		}
-		if .Alerts in ext {
-			html = inject_alerts(html)
-		}
-		if .Highlight in ext {
-			html = highlight_code(html, file_path)
-		}
-		if .Sections in ext {
-			html = wrap_sections(html)
-		}
-		page.body_html = html
+		page.body_html = md.process(body, ext, file_path)
 	}
 
 	if section == "" && is_index {
diff --git a/alerts.odin b/markdown/alerts.odin
similarity index 99%
rename from alerts.odin
rename to markdown/alerts.odin
index 852a7f4..483c765 100644
--- a/alerts.odin
+++ b/markdown/alerts.odin
@@ -1,5 +1,5 @@
 #+feature dynamic-literals
-package main
+package markdown
 
 import "core:fmt"
 import "core:strings"
diff --git a/emoji.odin b/markdown/emoji.odin
similarity index 99%
rename from emoji.odin
rename to markdown/emoji.odin
index eb8fab1..3d98729 100644
--- a/emoji.odin
+++ b/markdown/emoji.odin
@@ -1,5 +1,5 @@
 #+feature dynamic-literals
-package main
+package markdown
 
 import "core:strings"
 
diff --git a/footnotes.odin b/markdown/footnotes.odin
similarity index 99%
rename from footnotes.odin
rename to markdown/footnotes.odin
index f15f9a0..3248508 100644
--- a/footnotes.odin
+++ b/markdown/footnotes.odin
@@ -1,4 +1,4 @@
-package main
+package markdown
 
 import cm "vendor:commonmark"
 
diff --git a/footnotes_test.odin b/markdown/footnotes_test.odin
similarity index 99%
rename from footnotes_test.odin
rename to markdown/footnotes_test.odin
index 811a678..a4775cb 100644
--- a/footnotes_test.odin
+++ b/markdown/footnotes_test.odin
@@ -1,6 +1,6 @@
 #+feature dynamic-literals
 #+test
-package main
+package markdown
 
 import "core:strings"
 import "core:testing"
diff --git a/highlight.odin b/markdown/highlight.odin
similarity index 99%
rename from highlight.odin
rename to markdown/highlight.odin
index 4d3ffef..b7e415d 100644
--- a/highlight.odin
+++ b/markdown/highlight.odin
@@ -1,6 +1,6 @@
-package main
+package markdown
 
-import ts "treesitter"
+import ts "../treesitter"
 
 import "core:fmt"
 import "core:log"
diff --git a/markdown/markdown.odin b/markdown/markdown.odin
new file mode 100644
index 0000000..771a64e
--- /dev/null
+++ b/markdown/markdown.odin
@@ -0,0 +1,83 @@
+package markdown
+
+import cm "vendor:commonmark"
+
+import "core:encoding/json"
+import "core:strings"
+
+Extension :: enum {
+	Emoji,
+	Sidenotes,
+	Alerts,
+	Highlight,
+	Sections,
+}
+
+DEFAULT_EXTENSIONS :: bit_set[Extension]{.Emoji, .Sidenotes, .Alerts}
+
+process :: proc(body: string, ext: bit_set[Extension], file_path: string) -> string {
+	side_notes := make(map[string]string)
+	margin_notes := make(map[string]string)
+	clean_body := body
+	if .Sidenotes in ext {
+		clean_body, side_notes, margin_notes = strip_definitions(body)
+	}
+	html := cm.markdown_to_html_from_string(clean_body, {.Unsafe})
+	if .Emoji in ext {
+		html = expand_emoji(html)
+	}
+	if .Sidenotes in ext {
+		html = inject_notes(html, side_notes, margin_notes)
+	}
+	if .Alerts in ext {
+		html = inject_alerts(html)
+	}
+	if .Highlight in ext {
+		html = highlight_code(html, file_path)
+	}
+	if .Sections in ext {
+		html = wrap_sections(html)
+	}
+	return html
+}
+
+// Convert a ',' separated list of case-insensitive extension names to a bit set.
+parse_extension_list :: proc(s: string) -> (result: bit_set[Extension]) {
+	for part in strings.split(s, ",", allocator = context.temp_allocator) {
+		name := strings.to_lower(strings.trim_space(part), allocator = context.temp_allocator)
+		switch name {
+		case "emoji":
+			result += {.Emoji}
+		case "sidenotes":
+			result += {.Sidenotes}
+		case "alerts":
+			result += {.Alerts}
+		case "highlight":
+			result += {.Highlight}
+		case "sections":
+			result += {.Sections}
+		}
+	}
+	return result
+}
+
+// Given a map[Extension]bool, apply it to ext.
+apply_extension_config :: proc(ext: ^bit_set[Extension], config: json.Object) {
+	for name, val in config {
+		// TODO: Silently discards invalid values.
+		enabled := val.(json.Boolean) or_continue
+		switch name {
+		case "emoji":
+			if enabled {ext^ += {.Emoji}} else {ext^ -= {.Emoji}}
+		case "sidenotes":
+			if enabled {ext^ += {.Sidenotes}} else {ext^ -= {.Sidenotes}}
+		case "alerts":
+			if enabled {ext^ += {.Alerts}} else {ext^ -= {.Alerts}}
+		case "highlight":
+			if enabled {ext^ += {.Highlight}} else {ext^ -= {.Highlight}}
+		case "sections":
+			if enabled {ext^ += {.Sections}} else {ext^ -= {.Sections}}
+		}
+	}
+}
+
diff --git a/sectionate.odin b/markdown/sectionate.odin
similarity index 97%
rename from sectionate.odin
rename to markdown/sectionate.odin
index 5a44441..c69ea85 100644
--- a/sectionate.odin
+++ b/markdown/sectionate.odin
@@ -1,4 +1,4 @@
-package main
+package markdown
 
 import "core:strings"
 
diff --git a/site.odin b/site.odin
index 95e36a8..07e6a7a 100644
--- a/site.odin
+++ b/site.odin
@@ -8,6 +8,8 @@ import "core:mem"
 import "core:os"
 import "core:strings"
 
+import md "markdown"
+
 
 // Site is the primary workhorse.
 Site :: struct {
@@ -26,7 +28,7 @@ Site :: struct {
 	layouts_dir:         string,
 	params:              json.Object,
 	features:            bit_set[Feature],
-	markdown_extensions: bit_set[Markdown_Extension],
+	markdown_extensions: bit_set[md.Extension],
 }
 
 Feature :: enum {
@@ -35,22 +37,6 @@ Feature :: enum {
 	Watch,
 }
 
-Markdown_Extension :: enum {
-	Emoji,
-	Sidenotes,
-	Alerts,
-	Highlight,
-	Sections,
-}
-
-DEFAULT_MARKDOWN_EXTENSIONS :: bit_set[Markdown_Extension] {
-	.Emoji,
-	.Sidenotes,
-	.Alerts,
-	// .Highlight,
-	// .Sections,
-}
-
 // Configuration loaded from `thor.json`. Gets folded in to Site before
 // Flags
 Config_File :: struct {
@@ -89,7 +75,7 @@ init_site :: proc(site: ^Site, args: []string) {
 
 	// Set defaults
 	site.base_url = "http://localhost:8080"
-	site.markdown_extensions = DEFAULT_MARKDOWN_EXTENSIONS
+	site.markdown_extensions = md.DEFAULT_EXTENSIONS
 
 	_flags: Flags
 	flags.parse_or_exit(&_flags, args, .Odin, alloc)
@@ -163,7 +149,7 @@ site_apply_config :: proc(site: ^Site, config: Config_File, config_dir: string)
 
 	// Apply markdown extensions from config
 	if ext_obj, ok := config.markdown_extensions.(json.Object); ok {
-		apply_extension_config(&site.markdown_extensions, ext_obj)
+		md.apply_extension_config(&site.markdown_extensions, ext_obj)
 	}
 
 	if modules_arr, ok := config.modules.(json.Array); ok {
@@ -193,48 +179,8 @@ site_apply_cli_flags :: proc(site: ^Site, flags: Flags) {
 	if flags.watch {site.features += {.Watch}}
 	if flags.minify {site.features += {.Minify}}
 
-	site.markdown_extensions += parse_extension_list(flags.md_enable)
-	site.markdown_extensions -= parse_extension_list(flags.md_disable)
-}
-
-parse_extension_list :: proc(s: string) -> bit_set[Markdown_Extension] {
-	result: bit_set[Markdown_Extension]
-	if s == "" do return result
-	for part in strings.split(s, ",", allocator = context.temp_allocator) {
-		name := strings.to_lower(strings.trim_space(part), allocator = context.temp_allocator)
-		switch name {
-		case "emoji":
-			result += {.Emoji}
-		case "sidenotes":
-			result += {.Sidenotes}
-		case "alerts":
-			result += {.Alerts}
-		case "highlight":
-			result += {.Highlight}
-		case "sections":
-			result += {.Sections}
-		}
-	}
-	return result
-}
-
-apply_extension_config :: proc(ext: ^bit_set[Markdown_Extension], config: json.Object) {
-	for name, val in config {
-		enabled, is_bool := val.(json.Boolean)
-		if !is_bool do continue
-		switch name {
-		case "emoji":
-			if enabled {ext^ += {.Emoji}} else {ext^ -= {.Emoji}}
-		case "sidenotes":
-			if enabled {ext^ += {.Sidenotes}} else {ext^ -= {.Sidenotes}}
-		case "alerts":
-			if enabled {ext^ += {.Alerts}} else {ext^ -= {.Alerts}}
-		case "highlight":
-			if enabled {ext^ += {.Highlight}} else {ext^ -= {.Highlight}}
-		case "sections":
-			if enabled {ext^ += {.Sections}} else {ext^ -= {.Sections}}
-		}
-	}
+	site.markdown_extensions += md.parse_extension_list(flags.md_enable)
+	site.markdown_extensions -= md.parse_extension_list(flags.md_disable)
 }
 
 site_allocator :: proc(site: ^Site) -> mem.Allocator {