diff --git a/docs/docs/reference/01_init.md b/docs/docs/reference/01_init.md
new file mode 100644
index 000000000..c10c20c7b
--- /dev/null
+++ b/docs/docs/reference/01_init.md
@@ -0,0 +1,47 @@
+---
+title: "init"
+---
+
+`init` is the main entrypoint for mounting your application and its custom logic. It is a reserved function that Jan will look for to initialize your application.
+
+## Usage
+
+```js
+// javascript
+const core = require("@janhq/core");
+
+// typescript
+import * as core from "@janhq/core";
+```
+
+## init
+
+TODO
+
+## RegisterExtensionPoint
+
+`RegisterExtensionPoint` is used for app initialization.
+
+It lets you register functions/methods with the main application.
+
+```js
+import { RegisterExtensionPoint } from "@janhq/core";
+```
+
+```js
+type RegisterExtensionPoint = (
+  extensionName: string,
+  extensionId: string,
+  method: Function,
+  priority?: number
+)
+```
+
+## invokePluginFunc
+
+```js
+// index.ts
+function foo(id: number) {
+  return core.invokePluginFunc(MODULE_PATH, "getConvMessages", id);
+}
+```
diff --git a/docs/docs/reference/coreservice.md b/docs/docs/reference/02_coreservice.md
similarity index 99%
rename from docs/docs/reference/coreservice.md
rename to docs/docs/reference/02_coreservice.md
index 328489bc3..c9a7801be 100644
--- a/docs/docs/reference/coreservice.md
+++ b/docs/docs/reference/02_coreservice.md
@@ -1,5 +1,4 @@
 ---
-sidebar_position: 1
 title: "CoreService"
 ---
 
diff --git a/docs/docs/reference/events.md b/docs/docs/reference/03_events.md
similarity index 97%
rename from docs/docs/reference/events.md
rename to docs/docs/reference/03_events.md
index 5f3a03ab5..b86084cdc 100644
--- a/docs/docs/reference/events.md
+++ b/docs/docs/reference/03_events.md
@@ -1,5 +1,4 @@
 ---
-sidebar_position: 2
 title: "events"
 ---
 
diff --git a/docs/docs/reference/04_store.md b/docs/docs/reference/04_store.md
new file mode 100644
index 000000000..3dc7c6a5e
--- /dev/null
+++ b/docs/docs/reference/04_store.md
@@ -0,0 +1,15 @@
+---
+title: "store"
+---
+
+`store` is a helper object for working with Jan app's local storage database.
+
+By default, Jan ships with a [pouchDB](https://pouchdb.com/) client side noSQL db to persist usage state.
+
+_Note: default `store` logic is from [@data-plugin](https://www.npmjs.com/package/@janhq/data-plugin) which implements `StoreService`._
+
+## Usage
+
+```js
+import { store } from "@janhq/core";
+```
diff --git a/docs/docs/reference/filesystem.md b/docs/docs/reference/05_filesystem.md
similarity index 93%
rename from docs/docs/reference/filesystem.md
rename to docs/docs/reference/05_filesystem.md
index d9d863e46..3583492a7 100644
--- a/docs/docs/reference/filesystem.md
+++ b/docs/docs/reference/05_filesystem.md
@@ -1,5 +1,4 @@
 ---
-sidebar_position: 5
 title: "filesystem"
 ---
 
diff --git a/docs/docs/reference/06_preferences.md b/docs/docs/reference/06_preferences.md
new file mode 100644
index 000000000..1f00879b9
--- /dev/null
+++ b/docs/docs/reference/06_preferences.md
@@ -0,0 +1,19 @@
+---
+title: "preferences"
+---
+
+`preferences` is a helper object for adding settings fields to your apps.
+
+## Usage
+
+```js
+todo;
+```
+
+## registerPreferences
+
+## get
+
+## set
+
+## clear
diff --git a/docs/docs/reference/preferences.md b/docs/docs/reference/preferences.md
deleted file mode 100644
index 807665863..000000000
--- a/docs/docs/reference/preferences.md
+++ /dev/null
@@ -1,6 +0,0 @@
----
-sidebar_position: 4
-title: "preferences"
----
-
-## Usage
diff --git a/docs/docs/reference/store.md b/docs/docs/reference/store.md
deleted file mode 100644
index 32efae979..000000000
--- a/docs/docs/reference/store.md
+++ /dev/null
@@ -1,15 +0,0 @@
----
-sidebar_position: 3
-title: "store"
----
-
-`store` is a helper library for working with Jan app's local storage database.
-
-Jan ships with a [pouchDB](https://pouchdb.com/) client side noSQL db to persist usage state
-store (logic from @data-plugin which implements StoreService)
-
-## Usage
-
-```js
-import { store } from "@janhq/core";
-```
diff --git a/docs/sidebars.js b/docs/sidebars.js
index 0f8bb619c..ef67d1581 100644
--- a/docs/sidebars.js
+++ b/docs/sidebars.js
@@ -63,7 +63,7 @@ const sidebars = {
       type: "category",
       label: "Reference",
       collapsible: true,
-      collapsed: false,
+      collapsed: true,
       items: [
         {
           type: "autogenerated",