diff --git a/src/gloss/models/database.gleam b/src/gloss/models/database.gleam
index 0fa1a1a..93e5ede 100644
--- a/src/gloss/models/database.gleam
+++ b/src/gloss/models/database.gleam
@@ -1,3 +1,6 @@
+//// The database contains all the parsed data from the input files, but not
+//// processed content.
+
 import gleam/dict.{type Dict}
 import gleam/list
 import gleam/option.{None, Some}
@@ -9,6 +12,7 @@ import gloss/utils/date.{type Month}
 import gloss/utils/ordered_tree.{type OrderedTree}
 import gloss/utils/uniqid.{type Generator, type UniqID}
 
+/// Internal post ID, generated automatically.
 pub type PostID =
   UniqID
 
@@ -16,12 +20,15 @@ pub type PostWithID {
   PostWithID(id: PostID, post: Post)
 }
 
+/// All tags and their posts.
 pub type TagPosts =
   Dict(Tag, OrderedTree(PostWithID))
 
+/// Posts organised by month. This is used inside `YearPosts`.
 pub type MonthPosts =
   Dict(Month, OrderedTree(PostWithID))
 
+/// Posts organised by year, containing posts organised by month.
 pub type YearPosts =
   Dict(Int, MonthPosts)
 
@@ -37,6 +44,7 @@ pub opaque type Database {
   )
 }
 
+/// Create a new empty database.
 pub fn new() -> Database {
   Database(
     posts: new_tree(),
@@ -49,6 +57,7 @@ pub fn new() -> Database {
   )
 }
 
+/// Add a post into the database.
 pub fn add_post(db: Database, post: Post) -> Database {
   let post_date = post.get_date(post)
   let #(id, id_generator) = uniqid.get(db.id_generator)
@@ -100,22 +109,27 @@ pub fn add_post(db: Database, post: Post) -> Database {
   )
 }
 
+/// Add a page into the database.
 pub fn add_page(db: Database, page: Page) -> Database {
   Database(..db, pages: [page, ..db.pages])
 }
 
+/// Set the menu items of the database, replacing any old ones.
 pub fn set_menu(db: Database, menu: List(MenuItem)) -> Database {
   Database(..db, menu: menu)
 }
 
+/// Get posts organised by tags.
 pub fn tags(db: Database) {
   db.tags
 }
 
+/// Get posts organised by years and months.
 pub fn years(db: Database) {
   db.years
 }
 
+/// Get all posts in the given order.
 pub fn get_posts_with_ids(
   db: Database,
   order: ordered_tree.WalkOrder,
@@ -123,10 +137,12 @@ pub fn get_posts_with_ids(
   ordered_tree.to_list(db.posts, order)
 }
 
+/// Get pages.
 pub fn pages(db: Database) {
   db.pages
 }
 
+/// Get menu items.
 pub fn menu(db: Database) {
   db.menu
 }
diff --git a/src/gloss/models/header.gleam b/src/gloss/models/header.gleam
index c42eca2..61d0c0f 100644
--- a/src/gloss/models/header.gleam
+++ b/src/gloss/models/header.gleam
@@ -1,2 +1,3 @@
+/// A post or page header: a string key and a string value.
 pub type Header =
   #(String, String)
diff --git a/src/gloss/models/menu.gleam b/src/gloss/models/menu.gleam
index 727586d..bc1a812 100644
--- a/src/gloss/models/menu.gleam
+++ b/src/gloss/models/menu.gleam
@@ -1,3 +1,4 @@
+/// A menu item that points to some URL (relative or absolute) and has a name.
 pub type MenuItem {
   MenuItem(url: String, name: String)
 }
diff --git a/src/gloss/models/page.gleam b/src/gloss/models/page.gleam
index 39d03f3..a4b4e12 100644
--- a/src/gloss/models/page.gleam
+++ b/src/gloss/models/page.gleam
@@ -1,3 +1,5 @@
+//// A static page in the blog that is not part of any post lists or archives.
+
 import gloss/models/header.{type Header}
 
 pub type Page {
diff --git a/src/gloss/models/post.gleam b/src/gloss/models/post.gleam
index aa3da6e..ae86c99 100644
--- a/src/gloss/models/post.gleam
+++ b/src/gloss/models/post.gleam
@@ -1,15 +1,22 @@
+//// A post in the blog.
+
+import gleam/int
 import gleam/option.{type Option}
-import gleam/order.{type Order, Eq, Gt, Lt}
+import gleam/order.{type Order, Eq}
 import gloss/utils/date.{type Date}
 import gloss/utils/time.{type Time, Time}
 import gloss/utils/luxon.{type DateTime}
 import gloss/models/header.{type Header}
 
 pub type PostedAt {
+  /// The post only had date information.
   JustDate(Date)
+
+  /// The post had date, time, and timezone information.
   DateTime(date: Date, time: Time, tz: String, luxon: DateTime)
 }
 
+/// A tag is any string of lowercase characters, numbers, dashes, or underscores.
 pub type Tag =
   String
 
@@ -20,12 +27,15 @@ pub type Post {
     tags: List(Tag),
     headers: List(Header),
     content: String,
+    /// The content before the split, if any
     short_content: Option(String),
     date: PostedAt,
+    /// The post's order during that day, if there are multiple posts on the same day.
     order: Int,
   )
 }
 
+/// Get the date of the post.
 pub fn get_date(post: Post) -> Date {
   case post.date {
     JustDate(date) -> date
@@ -33,6 +43,7 @@ pub fn get_date(post: Post) -> Date {
   }
 }
 
+/// Get the time of the post, if it exists.
 pub fn get_time(post: Post) -> Option(Time) {
   case post.date {
     JustDate(..) -> option.None
@@ -40,6 +51,7 @@ pub fn get_time(post: Post) -> Option(Time) {
   }
 }
 
+/// Get the Luxon datetime of the post, if it exists.
 pub fn get_luxon(post: Post) -> Option(luxon.DateTime) {
   case post.date {
     JustDate(..) -> option.None
@@ -47,21 +59,25 @@ pub fn get_luxon(post: Post) -> Option(luxon.DateTime) {
   }
 }
 
+/// Compare two posts and get an order between them.
 pub fn comparator(a: Post, b: Post) -> Order {
   let a_date = get_date(a)
   let b_date = get_date(b)
 
   case date.compare(a_date, b_date) {
-    Lt -> Lt
-    Gt -> Gt
     Eq -> {
       let a_time = option.lazy_unwrap(get_time(a), time.nil_time)
       let b_time = option.lazy_unwrap(get_time(b), time.nil_time)
-      time.compare(a_time, b_time)
+      case time.compare(a_time, b_time) {
+        Eq -> int.compare(a.order, b.order)
+        other -> other
+      }
     }
+    other -> other
   }
 }
 
+/// Get the post's date or datetime formatted as an ISO 8601 formatted string.
 pub fn to_iso8601(post: Post) -> String {
   case post.date {
     JustDate(d) -> date.format_iso(d)
diff --git a/src/gloss/parser/common.gleam b/src/gloss/parser/common.gleam
index 1e2acd6..9d6964a 100644
--- a/src/gloss/parser/common.gleam
+++ b/src/gloss/parser/common.gleam
@@ -4,10 +4,12 @@ import gleam/list
 import gleam/bool
 import gloss/models/header.{type Header}
 
+/// The default file extension for source files.
 pub const filename_postfix = ".md"
 
 const header_separator = ":"
 
+/// An error that occurred when parsing content.
 pub type ParseError {
   EmptyFile
   HeaderMissing
@@ -19,16 +21,19 @@ pub type ParseError {
   MalformedHeader(header: String)
 }
 
+/// If the `value` is `Ok`, run `if_ok`, otherwise return `error`.
 pub fn try(value: Result(a, b), error: c, if_ok: fn(a) -> Result(d, c)) {
   result.try(result.replace_error(value, error), if_ok)
 }
 
+/// Parse given lines as headers.
 pub fn parse_headers(headers: List(String)) -> Result(List(Header), ParseError) {
   headers
   |> list.map(parse_header)
   |> result.all()
 }
 
+/// Parse given line as a header.
 pub fn parse_header(header: String) -> Result(Header, ParseError) {
   let header_parts = string.split(header, header_separator)
   let parts_amount = list.length(header_parts)
diff --git a/src/gloss/parser/menu.gleam b/src/gloss/parser/menu.gleam
index 4fa727e..17b265b 100644
--- a/src/gloss/parser/menu.gleam
+++ b/src/gloss/parser/menu.gleam
@@ -3,6 +3,7 @@ import gleam/string
 import gleam/result
 import gloss/models/menu.{MenuItem}
 
+/// Parse the content and return menu items.
 pub fn parse(content: String) {
   string.split(content, "\n")
   |> list.filter(fn(line) { string.length(line) != 0 })
diff --git a/src/gloss/parser/page.gleam b/src/gloss/parser/page.gleam
index 2b9ad99..7220f3c 100644
--- a/src/gloss/parser/page.gleam
+++ b/src/gloss/parser/page.gleam
@@ -4,6 +4,7 @@ import gleam/list
 import gloss/models/page.{type Page, Page}
 import gloss/parser/common.{type ParseError, EmptyFile, HeaderMissing, try}
 
+/// Parse page from file data.
 pub fn parse(filename: String, contents: String) -> Result(Page, ParseError) {
   let lines = string.split(contents, "\n")
 
diff --git a/src/gloss/parser/post.gleam b/src/gloss/parser/post.gleam
index 4a50b63..56826b1 100644
--- a/src/gloss/parser/post.gleam
+++ b/src/gloss/parser/post.gleam
@@ -16,6 +16,7 @@ import gloss/parser/common.{
   MalformedFilename, MalformedHeader, MonthNotInt, YearNotInt, try,
 }
 
+/// Post filenames must match this regex.
 pub const filename_regex = "^\\d{4}-\\d\\d-\\d\\d-.*\\.md$"
 
 const filename_separator = "-"
@@ -28,6 +29,7 @@ type FilenameMeta {
   FilenameMeta(date: PostedAt, order: Int, slug: String)
 }
 
+/// Parse post from file data.
 pub fn parse(filename: String, contents: String) -> Result(Post, ParseError) {
   let filename =
     string.slice(
diff --git a/src/gloss/paths.gleam b/src/gloss/paths.gleam
index 2cbc6f5..25c491e 100644
--- a/src/gloss/paths.gleam
+++ b/src/gloss/paths.gleam
@@ -1,9 +1,10 @@
 import gleam/int
 import gleam/string
+import gleam/list
 import gloss/models/post.{type Post}
 import gloss/models/page.{type Page}
-import gloss/paths/post as post_paths
 import gloss/utils/date.{type Month}
+import gloss/utils/ints/day
 
 pub const default_root = ""
 
@@ -44,9 +45,18 @@ pub const defaults = PathConfiguration(
 )
 
 pub fn default_single_post(post: Post) {
-  let post_path = post_paths.post_to_path(post)
+  let post_date = post.get_date(post)
+  let date_parts =
+    list.map(
+      [
+        post_date.year,
+        date.month_to_int(post_date.month),
+        day.to_int(post_date.day),
+      ],
+      pad_int,
+    )
 
-  "/" <> post_path.date_path <> "/" <> post_path.slug
+  "/" <> string.join(date_parts, "/") <> "/" <> post.slug
 }
 
 pub fn default_page(page: Page) {
@@ -81,3 +91,9 @@ pub fn default_list_page(path: String, page: Int) {
 pub fn default_html(path: String) {
   path <> ".html"
 }
+
+fn pad_int(number: Int) -> String {
+  number
+  |> int.to_string()
+  |> string.pad_left(to: 2, with: "0")
+}
diff --git a/src/gloss/paths/post.gleam b/src/gloss/paths/post.gleam
deleted file mode 100644
index abb8a89..0000000
--- a/src/gloss/paths/post.gleam
+++ /dev/null
@@ -1,31 +0,0 @@
-import gleam/string
-import gleam/int
-import gleam/list
-import gloss/models/post.{type Post}
-import gloss/utils/date
-import gloss/utils/ints/day
-
-pub type PostPath {
-  PostPath(date_path: String, slug: String)
-}
-
-pub fn post_to_path(post: Post) -> PostPath {
-  let post_date = post.get_date(post)
-  let date_parts =
-    list.map(
-      [
-        post_date.year,
-        date.month_to_int(post_date.month),
-        day.to_int(post_date.day),
-      ],
-      pad_int,
-    )
-
-  PostPath(date_path: string.join(date_parts, "/"), slug: post.slug)
-}
-
-fn pad_int(number: Int) -> String {
-  number
-  |> int.to_string()
-  |> string.pad_left(to: 2, with: "0")
-}
diff --git a/src/gloss/renderer.gleam b/src/gloss/renderer.gleam
index 24a324b..34784f8 100644
--- a/src/gloss/renderer.gleam
+++ b/src/gloss/renderer.gleam
@@ -55,9 +55,7 @@ pub fn render(
   let feed = render_feed(all_posts, compiled.posts, views)
 
   RenderDatabase(
-    orig: db,
     single_posts: posts,
-    index: [],
     pages: pages,
     index_pages: index_pages,
     tag_pages: tag_pages,
diff --git a/src/gloss/rendering/database.gleam b/src/gloss/rendering/database.gleam
index e3d8c70..dde6704 100644
--- a/src/gloss/rendering/database.gleam
+++ b/src/gloss/rendering/database.gleam
@@ -1,35 +1,41 @@
+//// The render database stores the rendered posts and pages.
+
 import gleam/dict.{type Dict}
 import lustre/element.{type Element}
-import gloss/models/database.{type Database, type PostID} as _
 import gloss/models/post.{type Post}
 import gloss/models/page.{type Page}
 import gloss/utils/date.{type Month}
 
-pub type PostList =
-  List(PostID)
-
+/// A post and its rendered content.
 pub type RenderedSinglePost {
   RenderedSinglePost(orig: Post, content: Element(Nil))
 }
 
+/// A page and its rendered content.
 pub type RenderedPage {
   RenderedPage(page: Page, content: Element(Nil))
 }
 
+/// A list page's page number and the page's content.
 pub type RenderedListPage {
   ListPage(page: Int, content: Element(Nil))
 }
 
 pub type RenderDatabase {
   RenderDatabase(
-    orig: Database,
+    /// Individual posts.
     single_posts: List(RenderedSinglePost),
-    index: PostList,
+    /// Individual pages.
     pages: List(RenderedPage),
+    /// "Index" list pages, meaning the main post flow.
     index_pages: List(RenderedListPage),
+    /// Tag list pages.
     tag_pages: Dict(String, List(RenderedListPage)),
+    /// Year list pages.
     year_pages: Dict(Int, List(RenderedListPage)),
+    /// Month list pages.
     month_pages: Dict(#(Int, Month), List(RenderedListPage)),
+    /// The feed (corresponding to the main post flow).
     feed: Element(Nil),
   )
 }
diff --git a/src/gloss/rendering/views.gleam b/src/gloss/rendering/views.gleam
index eb9122f..1783e9e 100644
--- a/src/gloss/rendering/views.gleam
+++ b/src/gloss/rendering/views.gleam
@@ -3,36 +3,57 @@ import gloss/compiler.{type CompiledPage, type CompiledPost}
 import gloss/models/post
 import gloss/models/page
 
+/// The base view renders the base page layout.
+///
+/// The three arguments are:
+/// - The inner content to render in the layout.
+/// - Extra elements to put inside `<head>`.
+/// - Text to add as a prefix to the `<title>` element.
 pub type BaseView =
   fn(Element(Nil), List(Element(Nil)), String) -> Element(Nil)
 
+/// Types of pages in the blog.
 pub type PageType {
+  /// Individual post.
   Post(post.Post)
+  /// Individual page.
   Page(page.Page)
+  /// Any other page.
   Other(title: String, description: String)
 }
 
+/// The meta view renders meta tags such as OpenGraph based on the page information.
 pub type MetaView =
   fn(PageType) -> List(Element(Nil))
 
+/// View to render an individual post.
 pub type SinglePostView =
   fn(CompiledPost) -> Element(Nil)
 
+/// View to render an individual page.
 pub type PageView =
   fn(CompiledPage) -> Element(Nil)
 
+/// View to render the RSS or Atom feed.
 pub type FeedView =
   fn(List(CompiledPost)) -> Element(Nil)
 
+/// Information passed for list pages.
 pub type ListInfo {
   ListInfo(
+    /// The path to prefix before the page number. E.g. `/index` and the resulting path would then be `/index/2`.
     root_path: String,
+    /// The page number of the current page being rendered.
     current_page: Int,
+    /// The amount of pages in the current list.
     total_pages: Int,
+    /// Posts on this page.
     posts: List(CompiledPost),
+    /// Any extra content to put on top of the page before the posts.
     extra_header: Element(Nil),
   )
 }
 
+/// View to render a list page. A list page is a page with many posts in a list.
 pub type ListPageView =
   fn(ListInfo) -> Element(Nil)
diff --git a/src/gloss/rendering/views/base.gleam b/src/gloss/rendering/views/base.gleam
index 8e36212..aac6afb 100644
--- a/src/gloss/rendering/views/base.gleam
+++ b/src/gloss/rendering/views/base.gleam
@@ -18,6 +18,7 @@ import gloss/config.{type Configuration}
 
 const tag_min_size = 0.5
 
+/// The base view pre-renders some content once, so that it can be reused for every render.
 pub type PreRendered {
   PreRendered(pages: Element(Nil), tags: Element(Nil), archives: Element(Nil))
 }
diff --git a/src/gloss/rendering/views/single_post.gleam b/src/gloss/rendering/views/single_post.gleam
index 4ad63da..8dd2823 100644
--- a/src/gloss/rendering/views/single_post.gleam
+++ b/src/gloss/rendering/views/single_post.gleam
@@ -13,10 +13,12 @@ import gloss/utils/date
 import gloss/utils/time
 import gloss/utils/luxon
 
+/// Generate a view that renders a full post.
 pub fn full_view(db: Database, config: Configuration) {
   view(_, True, db, config)
 }
 
+/// Generate a view that renders a post that's inside of a list.
 pub fn list_view(db: Database, config: Configuration) {
   view(_, False, db, config)
 }
diff --git a/src/gloss/writer.gleam b/src/gloss/writer.gleam
index a1ffc23..bf9a775 100644
--- a/src/gloss/writer.gleam
+++ b/src/gloss/writer.gleam
@@ -6,13 +6,8 @@ import lustre/ssg
 import lustre/ssg/xml
 import lustre/element
 import gloss/rendering/database.{type RenderDatabase} as _
-import gloss/models/post.{type Post}
-import gloss/paths/post.{type PostPath} as _
 import gloss/config.{type Configuration, WriteError}
 
-pub type PostPathGenerator =
-  fn(Post) -> PostPath
-
 pub fn write(db: RenderDatabase, config: Configuration) {
   let site =
     ssg.new(config.output_path)