Update README with microphone fallback documentation

README.md

@@ -163,6 +163,7 @@ BillBot uses tmpfiles.org for temporary file hosting to deliver PDF invoices via
 - **Item Parsing**: Complex item descriptions might not always be structured correctly
 - **Template Customization**: Limited invoice template customization options
 - **Offline Operation**: Requires internet connection for all operations
+- **Platform Restrictions**: When deployed on platforms with limited hardware access (like Hugging Face Spaces), voice input may not be available, but the application will fall back to text input mode.
 
 ## Future Improvements
 
@@ -197,6 +198,7 @@ GEMINI_API_KEY=your_gemini_api_key
 - **Voice Recognition Issues**: Make sure your microphone is working and try speaking clearly in a quiet environment
 - **PDF Generation Fails**: Check your Invoice Generator API credentials
 - **Gemini API Errors**: Verify your API key and ensure you're within usage limits
+- **No Microphone Available**: If you're using BillBot in an environment where microphone access is restricted (like Hugging Face Spaces), the application will automatically detect this and suggest using text input instead. This ensures the app remains functional even without voice input capabilities.
 
 ## About the Developer