diff --git a/Documentation.md b/Documentation.md
index dd867cd..4bdd649 100644
--- a/Documentation.md
+++ b/Documentation.md
@@ -2,7 +2,7 @@
 
 ## Table of Contents
 1. [Overview](#overview)
-2. [Features](#features)
+2. [Build System](#build-system)
 3. [Code Structure](#code-structure)
 4. [Class Reference](#class-reference)
 5. [Function Documentation](#function-documentation)
@@ -14,19 +14,48 @@
 
 PNG Metadata Editor is a graphical application built with Python and Tkinter that allows users to view, edit, add, and delete metadata in PNG files. The application leverages the Pillow library for PNG manipulation.
 
-## Features
+## Build System
 
-### Core Functionality
-- **Metadata Viewing**: Display all text chunks (tEXt, zTXt, iTXt) in PNG files
-- **Metadata Editing**: Add, modify, and delete metadata fields
-- **JSON Support**: Pretty-print JSON-formatted values
-- **Clipboard Integration**: Copy metadata values to clipboard
+### build.py Functionality
 
-### UI Features
-- Split-pane view with tree and detail panels
-- Status bar with temporary messages
-- Unsaved changes indicator
-- Responsive dialogs for adding/editing fields
+The `build.py` script provides a unified way to build the application across platforms:
+
+1. **Dependency Management**:
+   - Checks for `requirements.txt` and installs dependencies
+   - Falls back to default dependencies if file not found
+
+2. **PyInstaller Handling**:
+   - Verifies PyInstaller is installed
+   - Automatically installs it if missing
+   - Provides clear error messages if installation fails
+
+3. **Platform-Specific Builds**:
+   - Detects operating system (Windows, macOS, Linux)
+   - Applies appropriate build options for each platform
+   - Includes version information from `version.txt` when available
+
+4. **Build Process**:
+   ```python
+   # Main build workflow:
+   1. Check/install PyInstaller
+   2. Install dependencies
+   3. Determine platform options
+   4. Execute PyInstaller build
+   ```
+
+### Build Requirements
+
+- Python 3.6+
+- PyInstaller (auto-installed if missing)
+- Platform-specific icon files:
+  - `AppIcon.ico` for Windows
+  - `AppIcon.icns` for macOS
+
+### Build Output
+
+- Executable is created in the `dist/` directory
+- Temporary build files are stored in `build/`
+- Version information is embedded from `version.txt`
 
 ## Code Structure
 
@@ -37,7 +66,6 @@ png-meta-editor.py
 │   ├── __init__() - Initialization
 │   ├── setup_ui() - UI Construction
 │   ├── open_file() - File Operations
-│   ├── save_changes() - Save Functionality
 │   └── Various helper methods
 └── Supporting Functions
     ├── format_value_for_display()
@@ -249,10 +277,18 @@ if app.has_unsaved_changes:
 
 ## Development Notes
 
-### Design Decisions
-1. **State Management**: Uses `has_unsaved_changes` flag to track modifications
-2. **UI Separation**: Treeview and detail view maintain separate data representations
-3. **Error Handling**: Graceful degradation with user-friendly messages
+### Build System Improvements
+1. **Automatic Dependency Installation**:
+   - Script checks for `requirements.txt`
+   - Installs dependencies automatically
+
+2. **PyInstaller Management**:
+   - Verifies PyInstaller installation
+   - Auto-installs if missing
+
+3. **Platform Detection**:
+   - Automatically applies correct build options
+   - Handles version information consistently
 
 ### Future Improvements
 - Batch processing for multiple files