Update README.md

README.md

@@ -18,4 +18,14 @@ size_categories:
 ---
 
 Based on [Kaggle - Sign Language MNIST](https://www.kaggle.com/datasets/datamunge/sign-language-mnist).  
-Repackaged both CSV's into a single CSV with a field `datasetType` to assign each to its type.
+Repackaged both CSV's into a single CSV with a field `datasetType` to assign each to its type.
+
+The class mapping:
+
+```
+0: 'A', 1: 'B', 2: 'C', 3: 'D', 4: 'E', 5: 'F', 6: 'G', 7: 'H', 8: 'I',
+10: 'K', 11: 'L', 12: 'M', 13: 'N', 14: 'O', 15: 'P', 16: 'Q', 17: 'R',
+18: 'S', 19: 'T', 20: 'U', 21: 'V', 22: 'W', 23: 'X', 24: 'Y'
+```
+
+Labels 9 (J) and 25 (Z) are excluded as these letters require motion in ASL hence no such images are available.