update README about textnorm_retrained

README.md

@@ -35,6 +35,9 @@ espnet_model_zoo
 
 **The recipe can be found in ESPnet:** https://github.com/espnet/espnet/tree/master/egs2/powsm/s2t1
 
+> [!NOTE]
+> Jan 2026: We release a retrained version with improved ASR text normalization. 
+> It is located in the subfolder `textnorm_retrained` and has the same structure as the main model.
 
 ### Example script for PR/ASR/G2P/P2G