diff --git a/.vitepress/config.mts b/.vitepress/config.mts
index eb7d8c4..10e6e43 100644
--- a/.vitepress/config.mts
+++ b/.vitepress/config.mts
@@ -1,108 +1,137 @@
-import { defineConfig } from 'vitepress'
+import { defineConfig } from "vitepress";
 
 // https://vitepress.dev/reference/site-config
 export default defineConfig({
-  title: "Lysand Documentation",
-  description: "Documentation for Lysand, a new federated protocol",
-  srcDir: 'docs',
-  themeConfig: {
-    // https://vitepress.dev/reference/default-theme-config
-    nav: [
-      { text: 'Home', link: '/' },
-      { text: 'Specification', link: '/spec' },
-    ],
+    title: "Lysand Documentation",
+    description: "Documentation for Lysand, a new federated protocol",
+    srcDir: "docs",
+    themeConfig: {
+        // https://vitepress.dev/reference/default-theme-config
+        nav: [
+            { text: "Home", link: "/" },
+            { text: "Specification", link: "/spec" },
+        ],
 
-    sidebar: [
-      {
-        text: 'Spec Details',
-        items: [
-          { text: 'Spec', link: '/spec' },
-        ]
-      },
-      {
-        text: "Structures",
-        items: [
-          { text: "Content Format", link: '/structures/content-format' },
-          { text: "Custom Emoji", link: '/structures/custom-emoji' },
-          { text: "Collection", link: '/structures/collection' },
-        ]
-      },
-      {
-        text: "Cryptography",
-        items: [
-          { text: "Keys", link: "/cryptography/keys" },
-          { text: "Signing", link: "/cryptography/signing" },
-        ]
-      },
-      {
-        text: "Objects",
-        link: "/objects",
-        items: [
-          {
-            text: "Publications", link: "/objects/publications", items: [
-              { text: "Note", link: "/objects/note" },
-              { text: "Patch", link: "/objects/patch" },
-            ]
-          },
-          {
-            text: "Actors", link: "/objects/actors", items: [
-              { text: "User", link: "/objects/user" },
-            ]
-          },
-          {
-            text: "Actions", link: "/objects/actions", items: [
-              { text: "Like", link: "/objects/like" },
-              { text: "Dislike", link: "/objects/dislike" },
-              { text: "Follow", link: "/objects/follow" },
-              { text: "FollowAccept", link: "/objects/follow-accept" },
-              { text: "FollowReject", link: "/objects/follow-reject" },
-              { text: "Announce", link: "/objects/announce" },
-              { text: "Undo", link: "/objects/undo" },
-            ]
-          },
-          { text: "Server Metadata", link: "/objects/server-metadata" }
-        ]
-      },
-      {
-        text: "Federation",
-        items: [
-          { text: "Endpoints", link: "/federation/endpoints" },
-          { text: "User Discovery", link: "/federation/user-discovery" },
-          { text: "Server Actors", link: "/federation/server-actor" },
-        ]
-      },
-      {
-        text: "Extensions",
-        link: "/extensions",
-        items: [
-          { text: "Custom Emojis", link: "/extensions/custom-emojis" },
-          { text: "Reactions", link: "/extensions/reactions" },
-          { text: "Polls", link: "/extensions/polls" },
-          { text: "Is Cat", link: "/extensions/is-cat" },
-          { text: "Server Endorsements", link: "/extensions/server-endorsement" },
-          { text: "Events", link: "/extensions/events" },
-          { text: "Reports", link: "/extensions/reports" },
-          { text: "Vanity", link: "/extensions/vanity" },
-        ]
-      }
-    ],
+        sidebar: [
+            {
+                text: "Spec Details",
+                items: [{ text: "Spec", link: "/spec" }],
+            },
+            {
+                text: "Structures",
+                items: [
+                    {
+                        text: "Content Format",
+                        link: "/structures/content-format",
+                    },
+                    { text: "Custom Emoji", link: "/structures/custom-emoji" },
+                    { text: "Collection", link: "/structures/collection" },
+                ],
+            },
+            {
+                text: "Groups",
+                link: "/groups",
+            },
+            {
+                text: "Cryptography",
+                items: [
+                    { text: "Keys", link: "/cryptography/keys" },
+                    { text: "Signing", link: "/cryptography/signing" },
+                ],
+            },
+            {
+                text: "Objects",
+                link: "/objects",
+                items: [
+                    {
+                        text: "Publications",
+                        link: "/objects/publications",
+                        items: [
+                            { text: "Note", link: "/objects/note" },
+                            { text: "Patch", link: "/objects/patch" },
+                        ],
+                    },
+                    {
+                        text: "Actors",
+                        link: "/objects/actors",
+                        items: [{ text: "User", link: "/objects/user" }],
+                    },
+                    {
+                        text: "Actions",
+                        link: "/objects/actions",
+                        items: [
+                            { text: "Like", link: "/objects/like" },
+                            { text: "Dislike", link: "/objects/dislike" },
+                            { text: "Follow", link: "/objects/follow" },
+                            {
+                                text: "FollowAccept",
+                                link: "/objects/follow-accept",
+                            },
+                            {
+                                text: "FollowReject",
+                                link: "/objects/follow-reject",
+                            },
+                            { text: "Announce", link: "/objects/announce" },
+                            { text: "Undo", link: "/objects/undo" },
+                        ],
+                    },
+                    {
+                        text: "Server Metadata",
+                        link: "/objects/server-metadata",
+                    },
+                ],
+            },
+            {
+                text: "Federation",
+                items: [
+                    { text: "Endpoints", link: "/federation/endpoints" },
+                    {
+                        text: "User Discovery",
+                        link: "/federation/user-discovery",
+                    },
+                    { text: "Server Actors", link: "/federation/server-actor" },
+                ],
+            },
+            {
+                text: "Extensions",
+                link: "/extensions",
+                items: [
+                    {
+                        text: "Custom Emojis",
+                        link: "/extensions/custom-emojis",
+                    },
+                    {
+                        text: "Microblogging",
+                        link: "/extensions/microblogging",
+                    },
+                    { text: "Reactions", link: "/extensions/reactions" },
+                    { text: "Polls", link: "/extensions/polls" },
+                    { text: "Is Cat", link: "/extensions/is-cat" },
+                    {
+                        text: "Server Endorsements",
+                        link: "/extensions/server-endorsement",
+                    },
+                    { text: "Events", link: "/extensions/events" },
+                    { text: "Reports", link: "/extensions/reports" },
+                    { text: "Vanity", link: "/extensions/vanity" },
+                ],
+            },
+        ],
 
-    socialLinks: [
-      { icon: 'github', link: 'https://github.com/lysand-org/' }
-    ],
-    search: {
-      provider: "local",
+        socialLinks: [
+            { icon: "github", link: "https://github.com/lysand-org/" },
+        ],
+        search: {
+            provider: "local",
+        },
+        editLink: {
+            pattern: "https://github.com/lysand-org/docs/edit/main/docs/:path",
+        },
+        logo: "/logo.png",
     },
-    editLink: {
-      pattern: "https://github.com/lysand-org/docs/edit/main/docs/:path"
-    },
-    logo: "/logo.png",
-  },
-  lastUpdated: true,
-  cleanUrls: true,
-  titleTemplate: ":title · Lysand 2.0 Docs",
-  head: [
-    ['link', { rel: 'icon', href: '/favicon.png', type: 'image/png' }]
-  ],
-  lang: 'en-US',
-})
+    lastUpdated: true,
+    cleanUrls: true,
+    titleTemplate: ":title · Lysand 2.0 Docs",
+    head: [["link", { rel: "icon", href: "/favicon.png", type: "image/png" }]],
+    lang: "en-US",
+});
diff --git a/biome.json b/biome.json
new file mode 100644
index 0000000..ef6b12d
--- /dev/null
+++ b/biome.json
@@ -0,0 +1,20 @@
+{
+    "$schema": "https://biomejs.dev/schemas/1.6.4/schema.json",
+    "organizeImports": {
+        "enabled": true,
+        "ignore": ["node_modules", "dist", "cache"]
+    },
+    "linter": {
+        "enabled": true,
+        "rules": {
+            "recommended": true
+        },
+        "ignore": ["node_modules", "dist", "cache"]
+    },
+    "formatter": {
+        "enabled": true,
+        "indentStyle": "space",
+        "indentWidth": 4,
+        "ignore": ["node_modules", "dist", "cache"]
+    }
+}
diff --git a/bun.lockb b/bun.lockb
index d8a9601..e9a9c04 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/docs/extensions/microblogging.md b/docs/extensions/microblogging.md
index 4c50ccc..6dcaba0 100644
--- a/docs/extensions/microblogging.md
+++ b/docs/extensions/microblogging.md
@@ -2,7 +2,7 @@
 
 > [!WARNING]
 >
-> Before Lysand 3.0, microblogging was directly integrated into the core spec. As of Lysand 3.0, microblogging has been moved to an extension, as part of a larger effort to modularization. This document describes the new microblogging extension.
+> Before Lysand 3.0, microblogging was directly integrated into the core spec. As of Lysand 3.0, microblogging has been moved to an extension, as part of a larger modularization effort. This document describes the new microblogging extension.
 
 The Microblogging extension allows users to perform certain tasks related to microblogging, such as "boosting" (reposting) posts.
 
@@ -35,7 +35,7 @@ Here's an example of an `Announce` action:
 | :----- | :----- | :------- |
 | author | String | Yes      |
 
-URI of the [Actor](../objects/actors) who initiated the action.
+URI of the [Actor](./actors) who initiated the action.
 
 #### Object
 
@@ -43,9 +43,9 @@ URI of the [Actor](../objects/actors) who initiated the action.
 | :----- | :----- | :------- |
 | object | String | Yes      |
 
-URI of the object being announced. Must be of type [Note](../objects/note)
+URI of the object being announced. Must be of type [Note](./note)
 
-### Implementation
+#### Implementation
 
 When a [Note](../objects/note) object is announced, the client **SHOULD** display the original note with an indicator that it has been announced. The client **SHOULD** also display the number of times the note has been announced, such as a number next to a small icon like such on [Mastodon](https://joinmastodon.org/):
 
@@ -57,8 +57,8 @@ Furthermore, users should be notified when their notes are announced by other us
 ## Types
 
 ```typescript
-interface Announce extends Entity {
-    type: "Announce";
+interface Announce extends Extension {
+    extension_type: "org.lysand:microblogging/Announce";
     author: string;
     object: string;
 }
diff --git a/docs/groups.md b/docs/groups.md
new file mode 100644
index 0000000..f212bdb
--- /dev/null
+++ b/docs/groups.md
@@ -0,0 +1,69 @@
+# Groups
+
+Groups are a way to organize the visibility of objects on the server. Groups can be thought of as something similar to a Matrix room or a Discord channel, while also being similar to a Mastodon list.
+
+> [!NOTE]
+> Groups replace the old "visibility" system for Notes, which was designed for a microblogging context. Groups are more flexible and can be used for any application.
+>
+> Notes can still use visibility in cases where groups are not needed with the `followers` and `public` group URIs.
+
+# Group Entity
+
+The group entity encapsulates the details of a group. It adheres to the following structure:
+
+```json5
+{
+    "type": "Group",
+    "id": "ed480922-b095-4f09-9da5-c995be8f5960",
+    "uri": "https://example.com/groups/ed480922-b095-4f09-9da5-c995be8f5960",
+    "name": {
+        "text/html": {
+            "content": "The <strong>Woozy</strong> fan club"
+        }
+    },
+    "description": {
+        "text/plain": {
+            "content": "A group for fans of the Woozy emoji."
+        }
+    },
+    "members": "https://example.com/groups/ed480922-b095-4f09-9da5-c995be8f5960/members",
+}
+```
+
+## Fields
+
+### Name
+
+| Name | Type          | Required |
+| :--- | :------------ | :------- |
+| name | ContentFormat | No       |
+
+The name of the group. This field is optional. Can contain custom emojis, like most other text fields.
+
+### Description
+
+| Name        | Type          | Required |
+| :---------- | :------------ | :------- |
+| description | ContentFormat | No       |
+
+A description of the group. This field is optional. Can contain custom emojis, like most other text fields.
+
+### Members
+
+| Name    | Type   | Required |
+| :------ | :----- | :------- |
+| members | String | Yes      |
+
+The URI of the group's members list. This field is required. Resolves to a [Collection](./structures/collection) of [User](./objects/user) objects.
+
+## Implementation
+
+`Note` objects can be posted to groups by setting the `group` field to the URI of the group. If there is no `group` field, the note is posted to whoever is mentioned in the `to` field.
+
+Other values for `group` are:
+- `public` for public notes, which can be seen by anyone.
+- `followers` for notes that can be seen by the author's followers only.
+
+If the `group` field is empty, and nobody is mentioned in the `to` field, the note is only visible to the author.
+
+--> To finish
\ No newline at end of file
diff --git a/package.json b/package.json
index 1e5ec50..952c10e 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,12 @@
 {
-  "scripts": {
-    "docs:dev": "vitepress dev",
-    "docs:build": "vitepress build",
-    "docs:preview": "vitepress preview"
-  },
-  "devDependencies": {
-    "vitepress": "^1.1.0"
-  }
-}
\ No newline at end of file
+    "scripts": {
+        "docs:dev": "vitepress dev",
+        "docs:build": "vitepress build",
+        "docs:preview": "vitepress preview"
+    },
+    "devDependencies": {
+        "@biomejs/biome": "^1.7.1",
+        "vitepress": "^1.1.0"
+    },
+    "trustedDependencies": ["@biomejs/biome"]
+}