diff --git a/packages/config/README.md b/packages/config/README.md
index 1c3b27fa..8322e9a0 100644
--- a/packages/config/README.md
+++ b/packages/config/README.md
@@ -2,6 +2,26 @@
 
 ## Usage
 
+Field   | Type    | Purpose
+---     | ---     | ---
+root    | Boolean | Used to determine the root directory from the current one
+levels  | Array<Level> | Contains list of known levels with their configurations
+sets    | Object<string, string|Array<string>> | 
+libs    | Object<string, Library> | Libraries to use in sets
+plugins | ? | ?
+
+### Level
+
+- `layer`
+- `naming` - preset?
+- `path` - optional. legacy path
+
+### Library
+
+- `path` - to library which should better contain their own `.bemrc` file with their own sets
+
+## API
+
 ```js
 const bemConfig = require('@bem/sdk.config');
 const optionalConfig = { plugins: { create: { techs: ['styl', 'browser.js'] } } };