diff --git a/PRD.md b/PRD.md
index c9b87b7..bc0af63 100644
--- a/PRD.md
+++ b/PRD.md
@@ -236,6 +236,7 @@ KaraokeMerge/
 │   └── templates/
 │       └── index.html         # Web interface template
 ├── start_web_ui.py            # Web UI startup script
+├── test_tool.py               # Validation and testing script
 ├── requirements.txt           # Python dependencies
 ├── .gitignore                 # Git ignore rules
 ├── PRD.md                     # Product Requirements Document
@@ -394,6 +395,7 @@ data/preferences/
 - [x] Optimize performance for large datasets (37,000+ songs)
 - [x] Add progress indicators and error handling
 - [x] Generate detailed analysis reports (`--save-reports` functionality)
+- [x] Add test tool for validation and debugging
 - [x] Create startup script for web UI with dependency checking
 - [x] Add comprehensive .gitignore file
 - [x] Update documentation with required data file information