update md

Author: howardchi

README.md

@@ -16,6 +16,34 @@ Update git submodules
 $ npm run sync
 ```
 
+## Rebuild website
+
+first you have to install `canner-core` to generate html in http://reactd3.org
+
+```
+npm install -g canner-core
+```
+
+building web pages.
+
+```
+canner-core build canner.js
+```
+
+----
+
+We build most of our document in markdown.
+
+Inside `./docs` folder you can see there are two folders in each folder `md`, `md_origin`. `md_origin` is the original md files which need to compile via [smashmd](https://github.com/Canner/smash-md).
+
+You can just type
+
+```
+make smashmd
+```
+
+to recompile the whole original markdown files.
+
 
 ## License