diff --git a/docs/README.md b/docs/README.md
index fc9cca1..b08a4aa 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -14,6 +14,7 @@ for another doctype, feel free to open a PR with the description and role of you
 ## Cozy doctypes
 
 - [io.cozy.accounts](io.cozy.accounts.md): Konnector accounts
+- [io.cozy.ai.chat.assistants](io.cozy.ai.chat.assistants.md): AI assistants for chat
 - [io.cozy.ai.chat.conversations](io.cozy.ai.chat.conversations.md): Chat conversations with an assistant (AI)
 - [io.cozy.apps](io.cozy.apps.md): Apps installed in the Cozy
   - [io.cozy.apps.suggestions](io.cozy.apps.suggestions.md): Suggestions for apps that the user might find useful
diff --git a/docs/io.cozy.ai.chat.assistants.md b/docs/io.cozy.ai.chat.assistants.md
new file mode 100644
index 0000000..8764929
--- /dev/null
+++ b/docs/io.cozy.ai.chat.assistants.md
@@ -0,0 +1,72 @@
+[Table of contents](README.md#table-of-contents)
+
+# Chat assistants with an AI
+
+Cf [the stack documentation for AI](https://docs.cozy.io/en/cozy-stack/ai/).
+
+## `io.cozy.ai.chat.assistants`
+
+The `io.cozy.ai.chat.assistants` doctype is used to keep configuration of an assistant (AI).
+
+- `name`: {string} The name of assistant
+- `prompt?`: {string} What does this assistant do? How should it behave? What should it avoid doing?
+- `isCustomModel`: {boolean} Is the selected model custom or not?
+- `icon?`: {string} The avatar of assistant
+- `knowledgeBase?`: {array} A list of `{doctype, dirId}` entries scoping the assistant's
+  retrieval to specific Drive folders. Only `io.cozy.files` entries are taken into
+  account, and only a single folder is currently supported: if several are given,
+  the stack keeps the first one and ignores (with a warning) any other distinct
+  folder. When empty or absent, the assistant's retrieval is not scoped to a
+  particular folder.
+
+The `relationships.provider.data` object identifies the LLM account (an
+`io.cozy.accounts` document) used by the assistant, plus a `metadata.providerId`
+used by the stack to decide whether to forward a custom LLM configuration
+(model, API key, base URL) from that account to OpenRAG instead of the stack's
+default RAG configuration: `providerId` empty or equal to `"openrag"` means the
+default configuration is used.
+
+When a conversation is created via the cozy-stack `POST /ai/chat/conversations/:id`
+route with an `assistantID`, if the assistant has a non-empty `prompt`, a
+`role: "system"` message carrying that prompt is prepended to the conversation's
+`messages` (before the user's own message), and consumed as-is by OpenRAG's chat
+completion format. Clients should not render `system` messages as regular
+conversation turns.
+
+### Example
+
+
+```json
+{
+  "_id": "e21dce8058b9013d800a18c04daba326",
+  "_rev": "1-23456",
+  "cozyMetadata": {
+    "createdAt": "2024-09-24T13:24:07.576Z",
+    "createdOn": "http://cozy.localhost:8080/",
+    "doctypeVersion": "1",
+    "metadataVersion": 1,
+    "updatedAt": "2024-09-24T13:24:07.576Z"
+  },
+  "name": "My assistant",
+  "prompt": "This is my assistant",
+  "isCustomModel": false,
+  "icon": "[encoded base64 string of the content of the icon or svg binary]",
+  "knowledgeBase": [
+    {
+      "doctype": "io.cozy.files",
+      "dirId": "b21dce8058b9013d800a18c04daba333"
+    }
+  ],
+  "relationships": {
+    "provider": {
+      "data": {
+        "_type": "io.cozy.accounts",
+        "_id": "e21dce8058b9013d800a18c04daba322",
+        "metadata": {
+          "providerId": "openrag"
+        }
+      }
+    }
+  }
+}
+```
diff --git a/toc.yml b/toc.yml
index 602d73d..05881f1 100644
--- a/toc.yml
+++ b/toc.yml
@@ -1,6 +1,7 @@
 - README: ./docs/README.md
 - Accounts: ./docs/io.cozy.accounts.md
 - AI: ./docs/io.cozy.ai.chat.conversations.md
+- Assistants: ./docs/io.cozy.ai.chat.assistants.md
 - Apps: ./docs/io.cozy.apps.md
 - App suggestions: ./docs/io.cozy.apps.suggestions.md
 - Banking doctypes: ./docs/io.cozy.bank.md