Update README.md

README.md

@@ -26,6 +26,9 @@ as is done by my software [Mappa Mundi](https://github.com/rrtucci/mappa_mundi).
 
 SentenceAx (Sax) is a complete rewrite, from stem to stern, of O6.
 
-SentenceAx is a fine-tuning of BERT.
+SentenceAx is a fine-tuning of BERT written in PyTorch and Lightning.
 
-For more information about Sax, please visit [its GitHub repo](https://github.com/rrtucci/SentenceAx).
+This repo contains various large data files (input data, weights, logs)
+necessary for training or generated by training Sax.
+The Python source code for Sax can be found at
+[its GitHub repo](https://github.com/rrtucci/SentenceAx).