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README.md

@@ -33,6 +33,8 @@ This model was trained using the [Coqui TTS](https://github.com/coqui-ai/TTS) fr
 
 ## Usage
 
+**Note:** Text must be lowercased before synthesis. The model does not handle uppercase letters.
+
 ```python
 import torch
 import scipy.io.wavfile as wavfile