Update README.md

README.md

@@ -16,6 +16,10 @@ size_categories:
 - **Source**: Captured using a Vicon motion capture system.
 - **Size**: Over 9 hours of recordings at 120 frames per second (FPS).
 
+## Updates
+
+Added `audio.txt` reference file. This file maps audio IDs to their corresponding class labels. The data is segmented by the human subject who performed the associated motions.
+
 ## Folder Structure
 
 ```text