diff --git a/README.md b/README.md
index f90f19ecea69af2f18cc64a08d64cc52ebd2ec71..5ec8283f50c7a2d7e2676edaf616f70166bfc4af 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,37 @@ Smart and simple exchange managed by git issue tracking system.
 | Layer |  | specification |
 |:---:|:---:| --- |
 | 1 | Country | [ISO2](https://www.countrycode.org/) |
-| 2 | Category | |
-| 3 | Need/Level | |
+| 2 | Category | [Categories](#Categories) |
+| 3 | Grade | [Grade](#Grade) |
+| 4 | Type | [Type](#Type) |
 
 
-### Categories
+#### Categories
+| labels | additional tags |
+| --- | --- |
+| eat&drink | non-vegetarian<br>vegetarian<br>vegan |
+| home&living | appliance<br>construction<br>interior<br>supply<br>storage |
+| landscaping | exterior<br>horticulture |
+| electronics | home electronics<br>multimedia<br>communication<br>illumination |
+| tools&materials | tools<br>materials<br>storage |
+| dressing&lifestyle | underwear<br>workwear<br>clothes<br>accessories |
+| bodycare&health | bodycare<br>health |
+| art&culture | artwork<br>cultural goods |
+| services | craft<br>social<br>styling<br>design<br>repair<br>guidance |
+| knowlegde&information | soft media<br>hard media |
+| learning | workshops<br>teaching |
 
+#### Grade
+
+| label | description |
+| --- | --- |
+| Basic | existencial needs, base technologies, minimal standard |
+| Comfort | cultural needs, good performance, comfortable standard |
+| Luxury | luxury needs, high performance, specialists standard |   
+
+#### Type
+
+| label | description |
+| --- | --- |
+| Offer | offer goods and services |
+| Need | demand goods and services |