updated README.md

README.md

@@ -254,6 +254,6 @@ against the original data provided by the researchers on [Zenodo](https://zenodo
 
 ### Known Issues/Bugs
 
-1. Serializing data into Apache Arrow format (required to load dataset via HuggingFace's `datasets` library) introduces some segmentation
-mask integer values that do not map exactly to an anatomical feature. See the data loading [tutorial](tutorials/load_data.ipynb) for more information
-and temporary work-arounds.
+1. Serializing data into Apache Arrow format is required to make the dataset available via HuggingFace's `datasets` library. However, it introduces some segmentation
+mask integer values that do not map exactly to a defined [anatomical feature category](https://grand-challenge.org/algorithms/spider-baseline-iis/).
+See the data loading [tutorial](tutorials/load_data.ipynb) for more information and temporary work-arounds.