diff --git a/README.md b/README.md
index 3c39e98..fc5ef3a 100644
--- a/README.md
+++ b/README.md
@@ -31,17 +31,17 @@ CompareWare is an open-source platform for comparing tools (software, hardware,
### Key Concepts
- **PK (Primary Key)**: Unique identifier for table records (🔑)
- **FK (Foreign Key)**: Reference linking related tables (➡️)
+- **Core (core properties)**: name and description.
-### **Tables Overview**
+### Tables Overview
-### Core Tables
| Table | Columns (PK/FK) | Description | Example Data |
|-------|------------------|-------------|--------------|
| **urls** | `id` (PK), `url`, `created_at` | Stores comparison URLs | `1, "/laptops", 2024-03-01` |
-| **items** | `id` (PK), `url_id` (FK), `name`, `description`, `wikidata_id` | Comparison items | `"item1", 1, "MacBook Pro", "16-inch", "Q214276"` |
-| **properties** | `id` (PK), `name`, `global_usage_count` | Available properties | `25, "screen_size", 150` |
-| **item_properties** | `item_id` (PK/FK), `property_id` (PK/FK), `value` | Item-specific values | `"item1", 25, "16 inches"` |
-| **selected_properties** | `url_id` (PK/FK), `property_id` (PK/FK) | Active properties per URL | `1, 25` |
+| **items** | `id` (PK), `url_id` (FK), `wikidata_id` | Comparison items | `"item1", 1, "Q214276"` |
+| **properties** | `id` (PK), `name` | All available properties (including core) | `1.0, "name"`
`2.0, "description"`
`3.0, "screen_size"` |
+| **item_properties** | `item_id` (PK/FK), `property_id` (PK/FK), `value` | All property values including name/description | `"item1", 1.0, "MacBook Pro"`
`"item1", 2.0, "16-inch laptop"`
`"item1", 3.0, "16 inches"` |
+| **selected_properties** | `url_id` (PK/FK), `property_id` (PK/FK) | Active properties per URL (excludes core) | `1, 3.0` |
### Data Flow
```mermaid