diff --git a/docs/features/core.md b/docs/features/core.md
index aeda8b2..f0e77d9 100644
--- a/docs/features/core.md
+++ b/docs/features/core.md
@@ -1 +1,12 @@
-- [x]
\ No newline at end of file
+- [x] Scale canvas
+- [x] Scroll canvas
+- [] Render data's elements
+  - [] Text
+  - [] Rect
+  - [] Circle
+  - [] Image
+  - [] Point
+- [] Drag elements
+- [] Move elements' index
+- [] Transform elements's size
+- [] Undo action record
\ No newline at end of file
diff --git a/docs/features/idraw.md b/docs/features/idraw.md
index e69de29..593f526 100644
--- a/docs/features/idraw.md
+++ b/docs/features/idraw.md
@@ -0,0 +1,3 @@
+- [] Dashboard
+- [] Data input
+- [] Result export
\ No newline at end of file
diff --git a/packages/core/example/lib/data.js b/packages/core/example/lib/data.js
index fef0559..6027f5d 100644
--- a/packages/core/example/lib/data.js
+++ b/packages/core/example/lib/data.js
@@ -44,10 +44,6 @@ const data = {
   ]
 }
 
-function getData() {
-  return data;
-}
 
-export {
-  getData
-};
\ No newline at end of file
+
+export default data;
\ No newline at end of file
diff --git a/packages/core/example/main.js b/packages/core/example/main.js
index 9bc0b45..7e1d58f 100644
--- a/packages/core/example/main.js
+++ b/packages/core/example/main.js
@@ -1,10 +1,9 @@
-import { getData } from './lib/data.js';
+import data from './lib/data.js';
 import { doScale } from './lib/scale.js';
 import { doScroll } from './lib/scroll.js';
 
 const { Core } = window.iDraw;
 
-const data = getData();
 const mount = document.querySelector('#mount');
 const defaultConf = {
   scale: 0.5,