diff --git a/README.md b/README.md
index 5874425..a905d15 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 A WordPress plugin for managing Go (Baduk/Weiqi) tournament registrations. Collect player information through frontend forms and export entries to popular tournament management systems.
 
+**Version:** 0.05
+
 ## Features
 
 - **Frontend Registration Form** with shortcode support
@@ -10,7 +12,11 @@ A WordPress plugin for managing Go (Baduk/Weiqi) tournament registrations. Colle
 - **Automatic Rating Calculation** - Auto-computes rating from rank when needed
 - **Multiple Export Formats** - CSV, Pairgoth (JSON), OpenGotha (XML), McMahon (XML)
 - **Multi-Form Support** - Create and manage multiple registration forms
-- **Admin Dashboard** - View, delete, and export entries
+- **Admin Dashboard** - View, delete, export entries, and manage forms
+- **Custom Fields** - Add unlimited custom fields (text, email, textarea, select, checkbox) to forms
+- **Entry Editing** - Edit existing registrations from admin panel
+- **EGD Data Sync** - Batch update rank and rating from EGD for all entries with EGD numbers
+- **Responsive Design** - Frontend form with grid layout
 
 ## Installation
 
@@ -34,12 +40,15 @@ Replace `1` with your form ID. Find form IDs in the admin settings page.
 
 Navigate to **Go Form** in the WordPress admin menu to:
 
-- **Create Forms** - Add new registration forms
-- **Manage Forms** - View all forms with their shortcodes
-- **View Entries** - See all submissions for a form
+- **Create Forms** - Add new registration forms with names
+- **Manage Forms** - View all forms with their shortcodes and IDs
+- **View Entries** - See all submissions for a form in a sortable table
+- **Edit Entries** - Modify existing player registrations
 - **Delete Entries** - Remove individual registrations
-- **Delete Forms** - Remove a form and all its entries (cannot delete default form)
+- **Delete Forms** - Remove a form and all its entries (cascading delete)
 - **Export Data** - Download entries in various tournament formats
+- **Manage Custom Fields** - Add, edit, and delete custom fields per form
+- **EGD Data Sync** - Update rank and rating from EGD for all entries with EGD numbers
 
 ### EGD Search
 
@@ -63,12 +72,23 @@ Players can click the "Search EGD" button on the frontend form to look up their
 
 ## Database
 
-The plugin creates two tables:
+The plugin creates four tables:
 
-- `wp_go_form_forms` - Stores form definitions
-- `wp_go_form_entries` - Stores all player registrations
+- `wp_go_form_forms` - Stores form definitions (id, name, created_at)
+- `wp_go_form_entries` - Stores all player registrations with Go-specific fields
+- `wp_go_form_custom_fields` - Stores custom field definitions per form
+- `wp_go_form_entry_custom_values` - Stores custom field values for each entry
 
-Both tables are automatically removed when the plugin is uninstalled.
+All tables use foreign keys with CASCADE delete and are automatically removed when the plugin is uninstalled.
+
+### Rank System
+
+Ranks are stored as integers (0-47) mapping to:
+- 0-29: 30k to 1k
+- 30-38: 1d to 9d  
+- 39-47: 1p to 9p
+
+Rating auto-calculation: `rating = (rank * 100) - 900`
 
 ## Requirements
 
@@ -92,22 +112,83 @@ Both tables are automatically removed when the plugin is uninstalled.
 
 ### Actions
 
-- `admin_post_go_form_handle_submission` - Form submission handler
-- `admin_post_go_form_delete_entry` - Delete entry handler
-- `admin_post_go_form_create_form` - Create form handler
-- `admin_post_go_form_delete_form` - Delete form handler
+**Form Handling:**
+- `admin_post_go_form_handle_submission` - Frontend form submission handler
+- `admin_post_go_form_update_entry` - Update entry from admin panel
+
+**Form Management:**
+- `admin_post_go_form_create_form` - Create new form
+- `admin_post_go_form_delete_form` - Delete form and all its entries
+
+**Entry Management:**
+- `admin_post_go_form_delete_entry` - Delete single entry
+
+**Custom Fields:**
+- `admin_post_go_form_create_custom_field` - Create custom field
+- `admin_post_go_form_update_custom_field` - Update custom field
+- `admin_post_go_form_delete_custom_field` - Delete custom field
+
+**EGD Integration:**
+- `admin_post_go_form_update_egd_data` - Batch update entries from EGD database
+
+**Export:**
 - `admin_post_go_form_export_csv` - CSV export handler
-- `admin_post_go_form_export_pairgoth` - Pairgoth export handler
-- `admin_post_go_form_export_opengotha` - OpenGotha export handler
-- `admin_post_go_form_export_mcmahon` - McMahon export handler
+- `admin_post_go_form_export_pairgoth` - Pairgoth JSON export handler
+- `admin_post_go_form_export_opengotha` - OpenGotha XML export handler
+- `admin_post_go_form_export_mcmahon` - McMahon XML export handler
+
+### Filters
+
+None currently available.
+
+## Custom Fields
+
+Each form can have unlimited custom fields with the following types:
+
+| Type | Description | Options |
+|------|-------------|---------|
+| `text` | Single line text input | - |
+| `email` | Email address input with validation | - |
+| `textarea` | Multi-line text input | - |
+| `select` | Dropdown selection | Comma-separated options |
+| `checkbox` | Checkbox (yes/no) | - |
+
+### Custom Field Settings
+
+- **Public** - Display on frontend form
+- **Required** - Mandatory field
+- **Full Width** - Display outside the grid layout
 
 ## Security
 
 - All forms use WordPress nonces for CSRF protection
 - Admin actions require `manage_options` capability
-- All input is sanitized using WordPress sanitization functions
-- Direct file access is blocked
+- All input is sanitized using WordPress sanitization functions (`sanitize_text_field`, `sanitize_textarea_field`, `intval`)
+- Direct file access is blocked with `ABSPATH` check
+- Database operations use `$wpdb->prepare()` for SQL injection prevention
+
+## API Integration
+
+### European Go Database (EGD)
+
+The plugin integrates with the European Go Database for player data:
+
+- **Search API**: `https://europeangodatabase.eu/EGD/GetPlayerDataByData.php?lastname=X&name=Y`
+- **Player Data API**: `https://europeangodatabase.eu/EGD/GetPlayerDataByPIN.php?pin=XXXX`
+
+Fields retrieved from EGD:
+- Name, Last Name
+- Country Code
+- Club
+- Grade (rank text)
+- Grade_n (rank numeric)
+- Gor (rating)
+- Pin_Player (EGD PIN)
 
 ## Author
 
-Nikola Petrov nikola@petrovv.com
+Nikola Petrov - nikola@petrovv.com
+
+## License
+
+MIT License - See LICENSE file for details.