diff --git a/docs/src/demos/Marks/Highlight/index.vue b/docs/src/demos/Marks/Highlight/index.vue
index 70eefe826..ececcc218 100644
--- a/docs/src/demos/Marks/Highlight/index.vue
+++ b/docs/src/demos/Marks/Highlight/index.vue
@@ -64,7 +64,7 @@ export default {
         Document,
         Paragraph,
         Text,
-        Highlight,
+        Highlight.configure({ multicolor: true }),
       ],
       content: `
         <p>This isn’t highlighted.</s></p>
diff --git a/docs/src/docPages/api/marks/highlight.md b/docs/src/docPages/api/marks/highlight.md
index 1d98c4340..f30f6ea01 100644
--- a/docs/src/docPages/api/marks/highlight.md
+++ b/docs/src/docPages/api/marks/highlight.md
@@ -13,9 +13,10 @@ yarn add @tiptap/extension-highlight
 ```
 
 ## Settings
-| Option         | Type     | Default | Description                                                           |
-| -------------- | -------- | ------- | --------------------------------------------------------------------- |
-| HTMLAttributes | `Object` | `{}`    | Custom HTML attributes that should be added to the rendered HTML tag. |
+| Option         | Type      | Default | Description                                                           |
+| -------------- | --------- | ------- | --------------------------------------------------------------------- |
+| multicolor     | `Boolean` | `false` | Add support for multiple colors.                                      |
+| HTMLAttributes | `Object`  | `{}`    | Custom HTML attributes that should be added to the rendered HTML tag. |
 
 ## Commands
 | Command         | Options            | Description               |
diff --git a/docs/src/docPages/guide/collaborative-editing.md b/docs/src/docPages/guide/collaborative-editing.md
index 804a84256..5d36660a3 100644
--- a/docs/src/docPages/guide/collaborative-editing.md
+++ b/docs/src/docPages/guide/collaborative-editing.md
@@ -216,7 +216,7 @@ const server = Server.configure({
     const { requestHeaders, requestParameters } = data
     // Your code here, for example a request to an API
 
-    // If the user is not authorized …
+    // If the user is not authenticated …
     if (requestParameters.access_token !== 'super-secret-token') {
        return reject()
     }
@@ -226,7 +226,7 @@ const server = Server.configure({
         user_id: 1234,
     }
 
-    // If the user is authorized …
+    // If the user is authenticated …
     resolve(context)
   },
 })
@@ -315,14 +315,41 @@ server.listen()
 There is no method to restore documents from an external source, so you’ll need a [persistence driver](#persist-the-document) though. Those persistence drivers store every change to the document. That’s probably not needed in your external source, but is needed to make the merging of changes conflict-free in the collaborative editing backend.
 
 ### Scale with Redis (Advanced)
-To scale the WebSocket server, you can spawn multiple instances of the server behind a load balancer and sync changes between the instances through Redis. Install the Redis adapter and register it with hocuspocus:
+
+:::warning Keep in mind
+The redis adapter only syncs document changes. Collaboration cursors are not yet supported!
+:::
+
+To scale the WebSocket server, you can spawn multiple instances of the server behind a load balancer and sync changes between the instances through Redis. Import the Redis adapter and register it with hocuspocus. For a full documentation on all available redis and redis cluster options, check out the [ioredis API docs](https://github.com/luin/ioredis/blob/master/API.md).
 
 ```js
 import { Server } from '@hocuspocus/server'
 import { Redis } from '@hocuspocus/redis'
 
 const server = Server.configure({
-  persistence: new Redis('redis://:password@127.0.0.1:1234/0'),
+  persistence: new Redis({
+    host: '127.0.0.1',
+    port: 6379,
+  }),
+})
+
+server.listen()
+```
+
+If you want to use a redis cluster, use the redis cluster adapter:
+
+```js
+import { Server } from '@hocuspocus/server'
+import { RedisCluster } from '@hocuspocus/redis'
+
+const server = Server.configure({
+  persistence: new RedisCluster({
+    scaleReads: 'all',
+    redisOptions: {
+      host: '127.0.0.1',
+      port: 6379,
+    }
+  }),
 })
 
 server.listen()
diff --git a/packages/core/src/Extension.ts b/packages/core/src/Extension.ts
index ac38d3c71..d285136bf 100644
--- a/packages/core/src/Extension.ts
+++ b/packages/core/src/Extension.ts
@@ -19,7 +19,7 @@ export interface ExtensionConfig<Options = any, Commands = {}> {
    */
   addGlobalAttributes?: (this: {
     options: Options,
-  }) => GlobalAttributes,
+  }) => GlobalAttributes | {},
 
   /**
    * Commands
diff --git a/packages/core/src/Mark.ts b/packages/core/src/Mark.ts
index 3e0174982..57eb43b6b 100644
--- a/packages/core/src/Mark.ts
+++ b/packages/core/src/Mark.ts
@@ -60,7 +60,7 @@ export interface MarkConfig<Options = any, Commands = {}> extends Overwrite<Exte
     this: {
       options: Options,
     },
-  ) => Attributes,
+  ) => Attributes | {},
 
   /**
    * Commands
diff --git a/packages/core/src/Node.ts b/packages/core/src/Node.ts
index 1869164f8..b4a05b9bc 100644
--- a/packages/core/src/Node.ts
+++ b/packages/core/src/Node.ts
@@ -95,7 +95,7 @@ export interface NodeConfig<Options = any, Commands = {}> extends Overwrite<Exte
     this: {
       options: Options,
     },
-  ) => Attributes,
+  ) => Attributes | {},
 
   /**
    * Commands
diff --git a/packages/extension-highlight/src/index.ts b/packages/extension-highlight/src/index.ts
index cd172077b..c1f298907 100644
--- a/packages/extension-highlight/src/index.ts
+++ b/packages/extension-highlight/src/index.ts
@@ -7,6 +7,7 @@ import {
 } from '@tiptap/core'
 
 export interface HighlightOptions {
+  multicolor: boolean,
   HTMLAttributes: {
     [key: string]: any
   },
@@ -19,10 +20,15 @@ const Highlight = Mark.create({
   name: 'highlight',
 
   defaultOptions: <HighlightOptions>{
+    multicolor: false,
     HTMLAttributes: {},
   },
 
   addAttributes() {
+    if (!this.options.multicolor) {
+      return {}
+    }
+
     return {
       color: {
         default: null,