diff --git a/README.md b/README.md
index bb5501e..a0b54db 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,14 @@ you want. config.json instructs plugin loader which files to load. Currently we
 
 Everytime you want to access local plugin files in javascript, css or wherever, you prepend `$LOCATION$/` to the url. The plugin server takes care, that correct url is generated. This settings is found in `URL` value in server python code.
 
+In order for a plugin to work, javascript should export three function:
+
+```js
+plugin_init(div, entry)
+plugin_render(div, entry)
+plugin_save(div)
+```
+
 # Usage
 
 To use it, you must first paste the [javascript loader](plugin-loader.js) into custom entry editor section of Lexonomy configuration.